Malicious PDF — malware analysis report

Static analysis result for SHA-256 863012331c692685…

MALICIOUS

PDF

36.7 KB Created: 2020-08-31 14:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a93896107d6a0378ff38ac62d03562de SHA-1: 01416316c20b87d54041fecb0a261ccc87f0f939 SHA-256: 863012331c6926859d8b7b1703d7ee06aecd880edea575205dfdea79f473f744
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link-farming or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious redirection or SEO manipulation attack, likely delivered as a spearphishing attachment.

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.cc/pify?keyword=shirley+valentine+script+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_dfec514e5c5649ef909ec4bca966ccef.pdf
    • https://static.usrfiles.com/ugd/99afdc_065227f6fa1b43be88db1d9356ecd11d.pdf
    • https://static.usrfiles.com/ugd/455f95_207902dcd4da4b78a8c2e22e03c84fc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c2ee0dedd6a448a91324ba382142939.pdf
    • https://static.usrfiles.com/ugd/ee4a13_9968ab9e2e5e43c59fb97d4cac08b4fd.pdf
    • https://static.usrfiles.com/ugd/3d0627_741f9c76b0304c43beea6fc5a7d36dc0.pdf
    • https://static.usrfiles.com/ugd/87b9a8_95f05be0faf94ee4b093f4b8c8de7236.pdf
    • https://static.usrfiles.com/ugd/6d59ab_ea040798915149e2a2413c53e670541c.pdf
    • https://static.usrfiles.com/ugd/c1615c_7eeaa50dc5854cae9030e57b2329d865.pdf
    • https://static.usrfiles.com/ugd/70a38d_b17e120b1dfa47688b08a4c251c67bb0.pdf
    • https://static.usrfiles.com/ugd/49be48_0d15731fc2f5468e90962e7127ce9e3a.pdf
    • https://static.usrfiles.com/ugd/dad90e_0a069a43fdc64a6c9a16c4a5d138df70.pdf
    • https://static.usrfiles.com/ugd/b8c837_da67616249a94069aded818778114e0a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/lenureferibusabaxosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/ase_a4_study_guide.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_off00004f98.bin
f639948c815a0debd6b2fc42b99fee515d18ecc789894fb93cdb6a51c5c59915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F98 5508 bytes
font_01_sfnt_off00006259.bin
1f2e4b978022dda09e84c4966e20f432bde65b66d936f467e960203e8e614781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6259 10576 bytes

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