Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5f74b32506542a…

MALICIOUS

PDF

42.8 KB Created: 2020-11-01 21:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fb542696a0b54fb8d4504b86f92ba28 SHA-1: 4e93fa2bb5edb3bec79ce78b68b616834f73890f SHA-256: cd5f74b32506542a9bab3954b68f4ec34ce227fedd1c9711f01603fc27305e22
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign, aiming to drive traffic to malicious sites.

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.ru/123?keyword=beaks+of+finches+lab+teacher+s+guide
    • https://cdn-cms.f-static.net/uploads/4416331/normal_5f9b3f8a81faf.pdf
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5f9e474cc7e68.pdf
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f86f75cc7134.pdf
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f9c527a7df59.pdf
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5f9ad43b22009.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0498/1561/7691/files/daters_handbook_movie_watch_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/5575/7977/files/67531296315.pdf
    • https://cdn.shopify.com/s/files/1/0433/5448/8990/files/infant_pain_assessment_scale.pdf
    • https://cdn.shopify.com/s/files/1/0504/9712/6570/files/duloxetine_davis_drug_guide.pdf
    • https://s3.amazonaws.com/suximawo/ted_l_nancy_books.pdf
    • https://cdn.shopify.com/s/files/1/0486/4465/3214/files/examen_coprologico_en_perros.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006966.bin
8fe12164e9ee7cf1002aa1fdc734a5527e9296b5847efffd112b95fae1fb5642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6966 5536 bytes
font_01_sfnt_off00007c33.bin
313288b9be860be527e7801fc496d2a635fcd0b12b7c82ac4f7291417fdbad52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C33 10132 bytes

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