Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee80d95cd18f977…

MALICIOUS

PDF

38.9 KB Created: 2020-08-13 07:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6184ff42f9505ba6ce2d6328af64574a SHA-1: fad6ff1a767eb28105fa7387007f8256d007480d SHA-256: 6ee80d95cd18f9775d38cadfb5c417cbd20a88939ce5ed8ab689deccd7796517
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to shopify.com domains hosting PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=buku%20ajar%20hukum%20ketenagakerjaan%20pdf'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the redirector indicates a phishing or malicious redirection attempt.

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/wb?keyword=buku%20ajar%20hukum%20ketenagakerjaan%20pdf
    • http://files.lepinkandco.com/uploads/1/3/2/8/132814166/desuviwisu.pdf
    • http://files.coloradohomerepairandremodel.com/uploads/1/3/0/8/130814343/a6823a06f72.pdf
    • http://surupisox.muse2320fiber.com/uploads/1/3/1/6/131607407/foderanivedaje-polirari-saniwixixesen-tuzafowugikilan.pdf
    • http://vumux.acromarco.com/uploads/1/3/2/8/132814930/pujifaxoj_gesuniwi_migobileba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/elements_of_aerial_photo_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0147/files/kelilopoku.pdf
    • https://cdn.shopify.com/s/files/1/0451/0554/5369/files/wibud.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6568/files/25016806939.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/latezub.pdf
    • https://cdn.shopify.com/s/files/1/0434/7173/2889/files/vawakulejipowesagojope.pdf
    • https://cdn.shopify.com/s/files/1/0437/1195/5098/files/92926606473.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/37539805580.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/gemupukizivubaxal.pdf
    • https://cdn.shopify.com/s/files/1/0440/0345/9230/files/55090455605.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/rakeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/10603862813.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_off00005a57.bin
fa97c40fb167f12fd4ef4817442e3bb9e80e11a5038a490f76473b37757ba6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A57 5436 bytes
font_01_sfnt_off00006cbd.bin
df7a7346c0b07de525aec34ae4d6d810bf8d9e74ad5119f533036a6668223ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 9880 bytes

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