Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afd18530ad95764…

MALICIOUS

PDF

42.2 KB Created: 2020-08-08 22:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13bbcf963a904edbc2f54570f9d9e194 SHA-1: 5b26bd94fe345f8b3aa24f9299fcfe81b80f7dc4 SHA-256: 0afd18530ad957642d84684d05113e4bee49fcdc984666e8a6fb1b53656ed077
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for an 'unqualified audit report'.

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/pify?keyword=unqualified+audit+report+pdf
    • http://files.plymouthmusiclessons.com/uploads/1/3/0/7/130739488/bijuku_jevenepug.pdf
    • http://files.environmentalspillcontrolllc.com/uploads/1/3/1/4/131408256/f4e74d8.pdf
    • http://files.victorialandis.com/uploads/1/3/1/8/131856491/lifevupawav.pdf
    • http://files.apparelcolorwork.com/uploads/1/3/1/8/131856133/6506928.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0082/9848/files/asus_fan_xpert.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/bipuvugotofemaxazesivivom.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/63221464446.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/35920906905.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15796621189.pdf
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/1966417711.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9238/files/velivuwobakanedutizofav.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/tugek.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/convert_to_word_document_for_editing_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/vonedemidifakevugol.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/38063179328.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/sodunesevikozaxov.pdf
    • https://cdn.shopify.com/s/files/1/0436/9298/2427/files/31654889637.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/navojobofadalugenelubawap.pdf
    • https://cdn.shopify.com/s/files/1/0433/7467/4083/files/58367217492.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_off00006898.bin
faf50185944553e1116dd2601a6b82d6684eb43dad52c265b5af2da10735c839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6898 4972 bytes
font_01_sfnt_off00007999.bin
b08754677555d872a135fdbb146cbafb271dd58fe34366d9a0b80e784a47eb46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7999 10124 bytes

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