Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9e4645e172d79a…

MALICIOUS

PDF

93.6 KB Created: 2020-08-09 10:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ba111b797df4e8ee14ea1a44880f01 SHA-1: d404571d395df391788b41258f72c3375b8b89c7 SHA-256: 0a9e4645e172d79ad8bad85814f7bb5a8a5d7bc8cc253c6dd37cd9a8df268f23
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure (ttraff.com). The document body, though heavily obfuscated, contains text related to 'Ansel adams biography pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious links. The presence of a large number of external PDF links further indicates a link farm or redirection scheme.

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.com/pify?keyword=ansel+adams+biography+pdf
    • http://files.mindfulthanet.com/uploads/1/3/0/7/130739204/c4582d6281f4d.pdf
    • http://files.franciscoriosanderson.com/uploads/1/3/2/6/132681392/ecab6040a6.pdf
    • http://files.beautyequipmentcenter.com/uploads/1/3/1/4/131453574/ba8e972fb8.pdf
    • http://files.arshadsaeed.com/uploads/1/3/2/7/132740234/xipobeligonone.pdf
    • http://files.summitsalesrecruiting.com/uploads/1/3/2/6/132681303/3252394.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0434/1389/7368/files/glencoe_algebra_1_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/9266/3702/files/best_argumentative_essay.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/89433743240.pdf
    • https://cdn.shopify.com/s/files/1/0432/0795/0495/files/98033439007.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/zixodixomisarefidosowu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1764/7766/files/51464788372.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/merajivixulawewaja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17673355306.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/12398799132.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33435760041.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001252c.bin
d43117925386f3fd87b9132184bd7ccb04ccdf9568ff522bbbebf0bf4e390931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 3464 bytes
font_01_sfnt_off00013184.bin
268a33284ceaa257f0bc857a9eca497e870c196c6f5faceab060f1e31efcd669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 5688 bytes
font_02_sfnt_off000144bc.bin
3280f91829c91c289084f1eb7c1f1d5dd0133e3ec204b2198614eda2ba3dcc2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144BC 10508 bytes

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