Malicious PDF — malware analysis report

Static analysis result for SHA-256 69661a4e3fea0d96…

MALICIOUS

PDF

41.3 KB Created: 2020-08-09 16:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10325d2f62f23f325a17cd1aceca2597 SHA-1: 1a79f0808ee3d2ee29590826230cb01d3f1747e8 SHA-256: 69661a4e3fea0d96edfd49f7995c973fb61da6b7f204cd2745649e13b2cb7676
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as a 'top free pdf reader for android'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of invoice/payment lure language further supports a phishing or scam 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=top+free+pdf+reader+for+android
    • http://jurore.mytornradiofud2modelproject.com/uploads/1/3/2/8/132815002/rebegilaninopawamujo.pdf
    • http://files.ajportablebuildings.com/uploads/1/3/1/3/131378950/moxoxaren_ranefewope_dodasozam_lobavuviwudemo.pdf
    • http://files.sacredtellings.com/uploads/1/3/1/0/131071035/ximofevafam.pdf
    • http://files.hilarymccarthyart.com/uploads/1/3/1/3/131379844/gowexudevikefov.pdf
    • http://files.communitychurchsheppey.com/uploads/1/3/0/8/130874318/49948dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/problem_solving_creative_thinking_and_decision_making.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/guzasudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1702/files/35197574152.pdf
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/pitinekig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/54798891698.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/48452879429.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/68872568881.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/74009766616.pdf
    • https://cdn.shopify.com/s/files/1/0429/5730/8063/files/tiwajewuraza.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/86673908153.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_off0000661c.bin
f4e18e8b49c658a15397035572270380200e32d089c564e1a67921f08ad8e3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661C 4772 bytes
font_01_sfnt_off00007668.bin
9e66d2dba63d79a90f363d7c9fb65e329d00ff1dd28012a880f050bb6d65eccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7668 10052 bytes

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