Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d34c2facc65ec1…

MALICIOUS

PDF

36.2 KB Created: 2020-08-11 22:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd23786646ddc21489480ad2d2708a58 SHA-1: a4f3322d0a3037a1f8cfa0ab76e0ed7ebc15e4ff SHA-256: 87d34c2facc65ec189dd246f7c849ac1b095b0724a28237e0e6d6ece1cd1429c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a "clearsounds csc600 manual". The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm intended to distribute malicious content or manipulate search engine results. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=clearsounds%20csc600%20manual
    • http://files.coyotemusicstudio.com/uploads/1/3/0/7/130776786/819e4c12dcb.pdf
    • http://kijelofod.tektondesign.com/uploads/1/3/0/7/130775735/paxenivuvavasuzuvo.pdf
    • http://files.biesyiczadyfci.com/uploads/1/3/1/3/131380745/xakive.pdf
    • http://megoxe.buybps.com/uploads/1/3/2/6/132696030/forodixomiber.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1548/7137/files/upper_back_stretches_for_pain_relief.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/manufacturing_systems_engineering_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7339/6133/files/pusonadigenejometut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/bunomorefebavasizuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/supraventricular_tachycardia_ecg.pdf
    • https://cdn.shopify.com/s/files/1/0443/4529/5004/files/cancer_de_prostata_ministerio_da_saude_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/tigivekezutugodobimeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/tebiguweni.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/insurance_broker_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/vipajobuwonizowalofedude.pdf
    • https://cdn.shopify.com/s/files/1/0427/7937/7830/files/30784642863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65294746239.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_off00004e54.bin
21de20737edb28d093d9e668745940ceae9fcb3df7b106a9ca90555be92823a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E54 5288 bytes
font_01_sfnt_off0000602e.bin
aadb42849d25a6aec15e1bb9cff316f751898d8c2ebd3b46276aba7db14c1c70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602E 10428 bytes

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