Malicious PDF — malware analysis report

Static analysis result for SHA-256 775746020a8217a1…

MALICIOUS

PDF

43.7 KB Created: 2020-10-25 18:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cb73231e345b73a5f7428cdce6be12e2 SHA-1: 731e83108c2716a876793db35e03696792d59c4e SHA-256: 775746020a8217a105d3f94fa3c6dc7a526a31400765e047ebb64b92c1c9526f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to benign resources, but one critical link directs to known malicious redirector infrastructure. The document body, though partially corrupted, includes the malicious URL and appears to be an attempt to disguise malicious activity as a financial document. The presence of numerous links suggests an SEO manipulation or link farm tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.link/123?keyword=estados+financieros+basicos+bajo+niif+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f919b9576691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f889e323ed4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f8a4980dcdfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f8b125bad80b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f8a1e99e0f3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f8d70ec32f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f9122e9d5285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5f91ff4b9fd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f8763d0ccf5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_5f9591b9d7161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2878/2497/files/recovery_from_sd_card_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4492/1766/files/knot_theory_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9493/2640/files/rules_of_exponents_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/kekumirikiwarurapiremugod.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/trumpet_tune_henry_purcell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f26aea6-5b11-4e01-a65f-ca80244941a5/cerebro_de_pan_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182efc08-dec6-43b4-b52a-7e029d32f479/jividinijad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5582be13-2cee-4b7b-b473-bf19e07a3424/wedotijunoxuviroloto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dddd1ea-2d04-49b8-80ce-4f9d16d4e11e/victoria_secret_catalog_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288d42fe-c0c9-407f-a372-2434be214a25/vimepojisunemunebejabal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb16b34-bd6e-401a-8ea6-0738ad77eb4e/lolimisuleza.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_off00006718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 5288 bytes
SHA-256: 17298187194ef40885de9719fbc699cf0afbb8f34f863fed3e313810529c769a
font_01_sfnt_off0000791d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 11800 bytes
SHA-256: 0b0db2efe3cf0ab05cd615e11f214a5702e9c906587ca4cab47ff20d1e3c80af

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