Malicious PDF — malware analysis report

Static analysis result for SHA-256 052a9ee00cbe592c…

MALICIOUS

PDF

41.6 KB Created: 2020-07-28 21:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaae43968a004e9dff961a286a164b91 SHA-1: ac8941848093ccfec94e35516f1a6fc3d5257d15 SHA-256: 052a9ee00cbe592c05a295a80379a70c1c8fb80775b89a1c3f227415341443cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a 'complex rational functions worksheet'. This indicates a phishing or malware distribution attempt. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm or SEO manipulation 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.cc/pify?keyword=complex+rational+functions+worksheet
    • http://files.kaufmanautogroup.com/uploads/1/3/0/7/130775639/foxakipa.pdf
    • http://files.globalmusicp.com/uploads/1/3/1/4/131437806/zegeniliritesob.pdf
    • http://files.perfectlittleme.com/uploads/1/3/1/6/131607093/foborerukoxi.pdf
    • http://files.thejoyfulchildatrium.com/uploads/1/3/0/7/130776416/zazitalit.pdf
    • http://files.creativecounselingsrq.org/uploads/1/3/2/7/132710787/5366484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62222626122.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/vaxavolig.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/98654333367.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/zulebidulaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/kekolaxir.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/70528214470.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/zidazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/7060771085.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16994954809.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/xijofarefejamojopazerut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/64909552095.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/tosigegodidazuze.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_off00006501.bin
ee4e0c5cc6c1652ecef7807347c5d7cb3ba409d0b870c16f561101a85c2d431d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 5384 bytes
font_01_sfnt_off0000773a.bin
0b8e71bba06574b92a2b75a32f9bde4b7cae53f64f6174d7a467bd3de787fdbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773A 9888 bytes

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