Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4c0d5ebd914980…

MALICIOUS

PDF

37.5 KB Created: 2020-08-30 02:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83a149536f86a3a619e68b4a26fd461e SHA-1: 0d53cf440dc310a0a79a22ca28e62dddfb436fa2 SHA-256: 6a4c0d5ebd9149804cfedc6eb59a66a0bfafc18e56970aa887dff3f84ecc2049
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=gaslands+free+download', suggesting a lure for free software. The presence of many external PDF links further indicates a link farm, likely for SEO manipulation or distributing further malicious content. No scripts were extracted, but the ML classifier strongly indicates malicious intent.

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=gaslands+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/fd30ac_5fd17c5e93b94ba09ed7cfa66e2a699f.pdf
    • https://static.usrfiles.com/ugd/10b11f_6a635875375d4661998857523f792d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d850ccd029d4e1cb951f54a314fe7d0.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/zoxigiwasaxoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/performance_appraisal_template_sample.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/wekalimifuposi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4985/1811/files/kopojinabubawama.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/21069960696.pdf
    • https://static.usrfiles.com/ugd/b8c837_68ddddd5a1754db5928c765591c206e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca6aca370f124b1b9c1597a557f422a9.pdf
    • https://static.usrfiles.com/ugd/3826db_2dd59fb977744a3385632f8f7ddf94cf.pdf
    • https://static.usrfiles.com/ugd/0047a4_63593c732df041e886fe2cec4e8122de.pdf
    • https://static.usrfiles.com/ugd/4b7290_96f5fe411b0347398c99b8281cb9d811.pdf
    • https://static.usrfiles.com/ugd/b8c837_8575371583d74dd98a1c3cf25acc1b26.pdf
    • https://static.usrfiles.com/ugd/b8c837_a86d8827fcc54690a3be15e679b07105.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d54ad11e8584cbdb733ad4d6aea8d5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4abdd563b084907801b7395f72b7dc4.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_off0000547c.bin
49053898a82efafdec754a97c567f6e4a6fcf0089077f8f9002b9556a84e269a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x547C 5024 bytes
font_01_sfnt_off000065b3.bin
c64fb64b8e999b7e87936dbb88f98d61ed6460268142426b2b9f6f75fcdd9ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 10692 bytes

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