Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fb27b556ea0e16…

MALICIOUS

PDF

43.1 KB Created: 2020-10-31 12:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1040bd3791f537feff0b92cbbea36ec4 SHA-1: d119fb1c55852a67684d350df9d7f01b9200cf65 SHA-256: a6fb27b556ea0e16ac9439278642072b921eba5667919e59ae3d60c5e86c0877
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/123?keyword=guild+wars+2+how+to+use+emotes'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/123?keyword=guild+wars+2+how+to+use+emotes
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5f923e3af3ebc.pdf
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/zudigibefa.pdf
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f9a3f2192008.pdf
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5f946af928591.pdf
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/nosek-filap-dibagag-povugo.pdf
    • https://cdn-cms.f-static.net/uploads/4412379/normal_5f98b25c4c55f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gixawetopoli/expenses_entry_in_tally_erp_9.pdf
    • https://cdn.shopify.com/s/files/1/0502/5221/8541/files/five_ten_tennie_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/gakajelapexuj.pdf
    • https://cdn.shopify.com/s/files/1/0500/3165/7130/files/73874873336.pdf
    • https://cdn.shopify.com/s/files/1/0480/8808/8728/files/litanig.pdf
    • https://cdn.shopify.com/s/files/1/0502/4356/7771/files/divejukelotolidabu.pdf
    • https://cdn.shopify.com/s/files/1/0496/5027/0371/files/prairie_st_johns_staff.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_off00006730.bin
ae505ef51c1d1c410b31c9b0c4b0813668f906789dad3a0c28194ba3812e6976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6730 5320 bytes
font_01_sfnt_off0000792c.bin
a8caa9b595524b3c4472d45bd8850bf74c29437eb126f7ed3334875c36e88c80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792C 11356 bytes

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