Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d56ce2b53b28f9…

MALICIOUS

PDF

41.6 KB Created: 2020-08-19 16:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e78a9112f87ed2b368c9d70e543402f7 SHA-1: dea9910887e5870237c59c12456e495bbdb0b6f0 SHA-256: 03d56ce2b53b28f90ce3fac69c8fef4dd0486b3d2e60f1e5bf20f702d7afb8a7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text suggesting it is a job description, likely a lure. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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.ru/pify?keyword=business+development+job+description+pdf
    • http://files.jovonmiller.com/uploads/1/3/2/6/132683251/kijafis.pdf
    • http://jemek.krwoodworkings.com/uploads/1/3/1/4/131453624/8880803.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/mogibevotorofazexovuwoxeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/33940680968.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8416/files/business_environment_concept_significance_and_factors.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/dorubemixojulasil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4295/files/60025752256.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/purejizodovizunaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5961/files/xevibujujologosolutot.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/71136860840.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_off000064c1.bin
00a228b2fcf1d52d8ded2350c5cf8da514a2bbc22ad0a42eccb10cc798c09dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C1 5416 bytes
font_01_sfnt_off00007714.bin
5b61fea379f0cfe9756797dcf1ae040f110db3315423e2c9b99c6400e6794d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 10264 bytes

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