Malicious PDF — malware analysis report

Static analysis result for SHA-256 168c6771d812f9df…

MALICIOUS

PDF

46.6 KB Created: 2020-09-10 11:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cf1dd278474c13a6dd0eeef0051f634 SHA-1: e5e8c0c96fd2d7ac192009d407c7e4ff1d169c08 SHA-256: 168c6771d812f9df32c2dae5604d8f989e1283d2aa5767d57ea74a55259625ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, masquerading as an annual report, which are designed to redirect users to malicious websites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of the primary URLs leads to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further supports that this document is part of a link farm designed to distribute malicious content.

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.link/wix?keyword=kangnam+jevisco+annual+report
    • http://xuvopifa.thehockeyprofessor.org/uploads/1/3/0/8/130874426/lijulamuzo_dakow.pdf
    • http://files.manuscriptcritiqueservices.com/uploads/1/3/0/8/130874370/gowilug.pdf
    • http://files.tac-tx.com/uploads/1/3/1/3/131379117/d42d3d1f4040e.pdf
    • http://files.pantherpostnews.com/uploads/1/3/1/1/131164236/5d0c07bfb.pdf
    • http://files.npwcaz.org/uploads/1/3/1/8/131856112/8083979.pdf
    • http://ripovud.timsguitar.net/uploads/1/3/1/3/131378898/gamus-sedexopusomuzap.pdf
    • http://xevidozux.featherriversc.org/uploads/1/3/2/6/132681490/nivibulosezob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9f69bd_0261b26e105a49b9add96cc7d5e029ad.pdf
    • https://static.usrfiles.com/ugd/f6a907_91ece96e544349dab848babc35963511.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_a3d5bdf3410648229194c4288b3fbcef.pdf
    • https://static.usrfiles.com/ugd/ae059d_ee7d0b57e4c24302946dcd2e115de05e.pdf
    • https://static.usrfiles.com/ugd/05e3ad_70d639252459423482514cba90ababcf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/abhimaan_film_all_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/waxapujepomovabot.pdf
    • https://cdn.shopify.com/s/files/1/0435/3772/7637/files/gejigolowogegokurisibon.pdf
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/upsc_interview_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0440/1243/7662/files/edema_types.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_off000068a2.bin
3a4cd918cb8f3896781ace2ff698b77395bd1b4ab96c4544d83f20b73175dd59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A2 5240 bytes
font_01_sfnt_off00007a71.bin
b5fcababe20c3dd5a84a71447f6e4fb7b1a0d1c09cc1a1216789cb391bcc10c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A71 10672 bytes
font_02_sfnt_off00009ee5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE5 4324 bytes

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