Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8a5b9cc7799e06…

MALICIOUS

PDF

51.1 KB Created: 2020-08-31 20:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4de9eb6726de3443db67fcbce6f5d02d SHA-1: 24f7af17424ff9af42666a045687de64d99af90a SHA-256: 6f8a5b9cc7799e0601c378ac3c2ce9e9edb75a4a79a4498ed232ac0d9ef8bd76
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though partially garbled, includes text related to a 'date sheet' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=jkbose+10th+date+sheet+2019+regular
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/1df9ea_abd32f7500fe4264b59d28c3d511512c.pdf
    • https://static.usrfiles.com/ugd/eb6612_be4abd5e55e0432ca846c948be93d17d.pdf
    • https://static.usrfiles.com/ugd/5b5da7_d9346c2151f24226bfd7680eb2b37e1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_de81def0044f4711a94fb8dd501c1da2.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/naxewisoxasorofu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0754/8326/files/exposito_scion_of_abjuration_guide.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_38c39b8656bb4b27bac217350a236736.pdf
    • https://static.usrfiles.com/ugd/b8c837_607e5fb06bcc44f8b07ec7d86fae0efb.pdf
    • https://static.usrfiles.com/ugd/3b47cb_ae09c8c9d9684f06805d7e946de3c31b.pdf
    • https://static.usrfiles.com/ugd/b8c837_529951ec6117469db58261daf5e5997e.pdf
    • https://static.usrfiles.com/ugd/b8c837_042bcdc01125418b8b193e4ea30b423a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c9ac6d87a2b44e1a8b8648094a9387c.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a97.bin
91a61edb0148a32a8c214dc9b1530f2f20c07aca52ea1853b9518530ca820c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A97 5760 bytes
font_01_sfnt_off00006e20.bin
d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E20 2320 bytes
font_02_sfnt_off00007872.bin
4dacaf8bd2a0b3947f0b81eaab04cbe05d655a5e3b3a0f2ec217c3ca8b5900bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7872 10076 bytes
font_03_sfnt_off00009aec.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEC 16224 bytes
font_04_sfnt_off0000b074.bin
f56044a98886dbfc4b092664adc97623e7f796b95a2a39f39a5a0e4c6cb9c5a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 3748 bytes

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