Malicious PDF — malware analysis report

Static analysis result for SHA-256 849608b5ba87ac0f…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 11:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a55c0781e00329f4a278f77b4dc45ab5 SHA-1: c834abec98394cdef58a98ace91a989791d73de6 SHA-256: 849608b5ba87ac0fd026f162c3ec2433bb507b9240caa860d6102b4c632e0109
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.me/wix?keyword=chemistry+atoms+first+3rd+edition%252Aby+burdge%252Foverby+published+by+mcgraw-hill', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to book titles and the authoring application, likely serving as a lure to encourage clicks on the malicious links.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.me/wix?keyword=chemistry+atoms+first+3rd+edition%252Aby+burdge%252Foverby+published+by+mcgraw-hill
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/l_affaire_calas_voltaire.pdf
    • https://cdn.shopify.com/s/files/1/0457/7846/9020/files/mozujadosemavulurirur.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/29127222740.pdf
    • https://static.usrfiles.com/ugd/b8c837_951e570927e8432a904e5e6ccbc294f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea269253c2b649f3b3d778e6f3eb3586.pdf
    • https://static.usrfiles.com/ugd/a31856_9b591435e3224dd2912e888a0a2b717a.pdf
    • https://static.usrfiles.com/ugd/455f95_383c681890514494ac236aa6bbe77189.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fca2c49cc30418cb7af590b482add09.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f50a5e426af48a5a32e29de52799ca1.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/93524196934.pdf
    • https://cdn.shopify.com/s/files/1/0445/4963/6255/files/36887128846.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6195/files/tratamiento_sinusitis_bacteriana.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_off00005b7e.bin
faab7a4168a9fa89dae1e4d47e5752d4296315c0cf74c5f872b52c1ba927aba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7E 6168 bytes
font_01_sfnt_off00007086.bin
1b63117edb246c51d435ffd1d364606a82634f44698110627b150b11c390b0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7086 14300 bytes

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