Malicious PDF — malware analysis report

Static analysis result for SHA-256 c983d3896111ed4b…

MALICIOUS

PDF

43.3 KB Created: 2020-09-01 12:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4785e01bbf222f94af625b3f5cbbd0e SHA-1: c2bdcbe334f9b1b8daed9f2ecab693743a06a092 SHA-256: c983d3896111ed4bcba57643d5153c0f510e822619076e1578838af8bc48bc7b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, 'https://ttraff.com/wix?keyword=balancing+equations+worksheet+free', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for educational content. The presence of numerous other links to external PDFs, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=balancing+equations+worksheet+free
    • https://static.usrfiles.com/ugd/3aee12_ee60223a58b34d869e468c876875687f.pdf
    • https://static.usrfiles.com/ugd/b8c837_43e3d64818224ac5b1e3f2e38b3bbd34.pdf
    • https://static.usrfiles.com/ugd/3fc21f_4b699c355a0b49cdbf906aa9b2df942f.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_3927539ba8b342e49dc1adc5219cd258.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2905813d1b94269b7e4016a43023e5c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/65641955070.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/zosafi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/71316999840.pdf
    • https://cdn.shopify.com/s/files/1/0438/6386/7552/files/rerokepufupamemasulejenog.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2821/files/nakefixovodutawafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0209/1929/files/braggart_noun_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/vavawujawolaxunuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/23236230324.pdf
    • https://static.usrfiles.com/ugd/39cb9d_bda54d96af294c8c809cc392b41dd114.pdf
    • https://static.usrfiles.com/ugd/b8c837_7db0d350fd5647a1a2727bb7f3977c85.pdf
    • https://static.usrfiles.com/ugd/f84671_af81c539659f4542a13a7b1e1599d537.pdf
    • https://static.usrfiles.com/ugd/cafc24_85614a7fe02d4ee2a2b27c3db8e90acc.pdf
    • https://static.usrfiles.com/ugd/b8c837_55d3f6d278d84667b42ec3c2829b52a1.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a7d.bin
fb14e7f94bb4bef4aa2be5bde856d00aa7cf068d29d4f86a038e2a0b3d4a1c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7D 5472 bytes
font_01_sfnt_off00007d26.bin
099027d7d46d9eee0ff51b576615dc1763562243cbcc4dfbbfc86dd076edb3e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D26 10188 bytes

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