Malicious PDF — malware analysis report

Static analysis result for SHA-256 0054c95e8c6c609f…

MALICIOUS

PDF

53.7 KB Created: 2020-08-12 03:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e81f8a47b30361dacb78b018fcd1c21d SHA-1: 7a58fa7d419ac977dcadb2ee1907d91109c6c116 SHA-256: 0054c95e8c6c609f66e35fd6a99a090bb6f0d778b74d8486065b77a5bdcaa163
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, suggesting a phishing or drive-by download attempt. The presence of numerous external PDF links indicates a link farm strategy, likely to improve search engine ranking for 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.com/pify?keyword=the+plague+albert+camus+pdf
    • http://files.bradfordscholarship.org/uploads/1/3/0/7/130739814/ef9fb46d483bd5.pdf
    • http://files.brightonandhovehypnobirthing.co.uk/uploads/1/3/1/3/131382330/f989068.pdf
    • http://files.jkrometisdesign.com/uploads/1/3/2/8/132814364/73b7348f.pdf
    • http://files.julindassalon.com/uploads/1/3/1/3/131398374/bozerulugal_xururi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/56417044685.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/mejobezadoxar.pdf
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/gafim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/wilowuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/987948479.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/storytelling_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/tipufewidagoxawumizi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/57252518658.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/86921169053.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/48425564241.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/98834474026.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_off00009538.bin
58f6f8da56fec1b6cab92d3b00ce53b44a6e07ce6175786697c2908c986a358f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9538 5660 bytes
font_01_sfnt_off0000a846.bin
7cbfa144a99c34202e40f7397b5b205fe5876ef7944d402e708f0fa9da03c11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA846 9908 bytes

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