Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c74256bd1aaf91b…

MALICIOUS

PDF

50.6 KB Created: 2020-10-27 11:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 72d3790335f07c3a1445ce2c5ae9a349 SHA-1: 20675a530eecce7f486459c7d55be4dd03cf11b0 SHA-256: 6c74256bd1aaf91b0c02af9ba7db22d750e9c31f2f87b4463cfb0e7e22781f37
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=can+crested+geckos+eat+fruit+and+vegetables In PDF document text
    • https://mizuzakulidux.weebly.com/uploads/1/3/4/4/134471721/7230654.pdfIn PDF document text
    • https://zovodexipelozas.weebly.com/uploads/1/3/4/4/134401167/fapefigigej_dumon.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/a48b0b15e6.pdfIn PDF document text
    • https://sevurefomofib.weebly.com/uploads/1/3/4/4/134451272/9190261.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/5c6ad5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f8e886e137b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f90646d60221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f8b9d64b64cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5f97879b804e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f8c43ed5408b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/54e0bb2e-336a-4736-b8c0-b5752425cdcc/cdj_2000_nexus_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14b9b28-17c2-42d2-a1a1-65f2cc36f1f5/xasezoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6027a252-bb9c-4294-9e16-bf35a359f749/31674778225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2520f695-114d-48aa-8a3d-d3b8e4890c30/doom_movie_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73716e52-d993-4871-9bde-8bcbf8eaa600/super_spontan_all_star_minggu_1_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fbf95aa-e5e4-49ea-aab1-d78fa7f17452/physics_of_throwing_a_football.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92eb13e1-0db0-4c6e-950f-b42661f7d188/7331260066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4652cbf-1495-4357-abce-9a5349972686/94776444946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8773/9035/files/appartement_te_huur_turnhout_3_slaapkamers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4825/8714/files/74812924200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2808/7452/files/sensor_technology_in_iot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4411/8434/files/jirujemerivapifowigab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3520/9127/files/nelidapopokodidiwisubab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0960/5273/files/jacksonville_nc_dmv_title.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9087/9667/files/varietas_cabai_rawit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000788b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x788B 5360 bytes
SHA-256: 52a018cb8efe038e57a53bd656f877697b5a136a478bd40303f6950f326bcaa4
font_01_sfnt_off00008adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADC 10376 bytes
SHA-256: 4227d1574122ee0d9e3c20d516afca86a4ed143f9bc3fea99ee25f5f8210c892
font_02_sfnt_off0000ae83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE83 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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