Malicious PDF — malware analysis report

Static analysis result for SHA-256 71eb24bb28039973…

MALICIOUS

PDF

33.7 KB Created: 2020-08-19 11:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30bfefb4d80019d75efdaf1c0f97e03 SHA-1: 5294beb809160658eb44597b8296d0fafd17fff5 SHA-256: 71eb24bb2803997388698ba4d7bdafd58b70a4455c4088e35acb8649ff06a7c7
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=kenny+g+songbird+alto+sax+sheet+music`. Additionally, it features a link farm with numerous PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.cc/pify?keyword=kenny+g+songbird+alto+sax+sheet+music
    • http://wegajorer.millwoodsphysiotherapy.com/uploads/1/3/1/6/131607310/02173490eb11.pdf
    • http://pefimasa.hollyreynoldsart.com/uploads/1/3/0/7/130775129/b44f3aa43.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/46068854776.pdf
    • https://cdn.shopify.com/s/files/1/0449/9508/4452/files/act_practice_math_tests.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/88246367055.pdf
    • https://cdn.shopify.com/s/files/1/0438/8156/2280/files/786012137.pdf
    • https://cdn.shopify.com/s/files/1/0437/6884/0341/files/42484076218.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/62387261523.pdf
    • https://cdn.shopify.com/s/files/1/0430/6776/8981/files/osrs_family_crest_quick_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/borislav_stankovic_necista_krv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/avidemux_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/gugorilemuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/fasipera.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/zisawovijalusibolaxufaz.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_off00004531.bin
221a5f02be68c6a21a1889bdc08f5070434993c0cea53c581733ba768dc48132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4531 5632 bytes
font_01_sfnt_off00005838.bin
90bbe9efe924c65bb13db9f18e9e624c8b6449b8f0c17fdedab210e0c2b5ad98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5838 9916 bytes

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