Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feca0c54072e2f6…

MALICIOUS

PDF

44.8 KB Created: 2020-08-29 23:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a46ac36b73d76d9159a76570651205e3 SHA-1: 7fa1debe170dff7c77139f92a6c271d402427564 SHA-256: 5feca0c54072e2f6be2d0281f70c7a0eb6bde646f1c7ed0db6c45e0ddc924c15
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text suggesting an invoice or payment lure, aligning with the SE_INVOICE_LURE heuristic. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or redirection strategy to a malicious site.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/wix?keyword=the+anatomy+of+greatness
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_7a738bd1569b4c1b8ac1690591a78efb.pdf
    • https://static.usrfiles.com/ugd/07ef24_d7e0fc5e0dce4a799401345c16b64535.pdf
    • https://static.usrfiles.com/ugd/d01287_bcf41b09c051421ea4795098dc17f21b.pdf
    • https://static.usrfiles.com/ugd/5438e3_f80109a3d9d3480da9dbb8d44915ff1b.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1480/files/17558426053.pdf
    • https://cdn.shopify.com/s/files/1/0429/2509/7126/files/tukuligetijedoporaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/pufipumilefumefuwelifiki.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/44904872054.pdf
    • https://cdn.shopify.com/s/files/1/0435/2347/3560/files/88461102520.pdf
    • https://cdn.shopify.com/s/files/1/0441/2253/8136/files/kitz_ball_valve_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0441/0825/1288/files/openstax_college_physics_instructor_solution_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/android_10_oneplus_7_pro_t_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/63982695792.pdf
    • https://cdn.shopify.com/s/files/1/0446/5885/1993/files/netgear_wndr3700_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6567/1833/files/deutsche_bahn_karriereportal_anmelden.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_off000064d2.bin
e55968e5ea769e179086cf29221a6aca22bb0af267427a70b4e4b15b80e69a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 4940 bytes
font_01_sfnt_off00007573.bin
fe2c274c7a0cc8d2dd850dc55164456ff764fd0a8f5a34cb9b61a8221475ca23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7573 10300 bytes
font_02_sfnt_off000098a3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A3 4324 bytes

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