Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e20935d5d0f8cd…

MALICIOUS

PDF

41.1 KB Created: 2020-10-27 01:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a46b6a118887ff4e44bfc39899c663b5 SHA-1: 3815c8859299f7c428e1b579eb67200709cee5e0 SHA-256: 26e20935d5d0f8cde226cc0364cbecc5b6346fff2cea9c575f9b7e9b34654614
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirectors and SEO link farms, indicating a malicious intent to direct users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=country+flame+wood+stove+manual In PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/sabibogutuxe.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/vuzilebabosudos_bogugukuz.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/tukowab.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/fc781947b62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f927f6dc93d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_5f958cbe96c4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5f8f1e025f4d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f972a66f0386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5f974b85e45ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/zimipovimakuxiduloziwep.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/lilidezev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0749/0199/files/mat_miller_analogies_test_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2983/7982/files/35933761528.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7003/0492/files/xiketofawuniperajisitu.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/27077497267.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/41403176971.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/banderas_del_mundo.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/nekegeviwelemamojita.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/bsc_part_1_physics_practical_book_hindi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9876/1125/files/radukejizabonakodova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2097/3729/files/mower_county_jail_warrants.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5086/4287/files/huapango_de_moncayo_partitura_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4735/2485/files/biblical_leadership_principles.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000630a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630A 5212 bytes
SHA-256: b7554f1e06a52656c9afdf92fdc46d042cb320e2fd6d09f9b307f881d2287245
font_01_sfnt_off000074cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74CB 10016 bytes
SHA-256: 54bbdc7a116b46c6e157e917dd4f2e97a709ec4f1e598c7c363fbbe3d51c05ee