Malicious PDF — malware analysis report

Static analysis result for SHA-256 837e617502eb376d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-22 07:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72a44ceaa1e8446e923c83ff5379ecd9 SHA-1: 4009d1a6b8daef87e529ff31fe35bb4ca62b9a37 SHA-256: 837e617502eb376d80bd1ec504c50a14f11a79d78d15c8e7866f4274136ad4b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to drive traffic to malicious sites.

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=hyd+miya+bhai+song
    • http://files.aharrisbrown.com/uploads/1/3/1/3/131381078/bafozebemipidojedid.pdf
    • http://files.oldsheriffshouse.org/uploads/1/3/0/8/130874240/5688021.pdf
    • http://files.gcwomensclub.com/uploads/1/3/1/4/131453036/gofudagogumaxotuloj.pdf
    • http://files.earthspringacupuncture.com/uploads/1/3/1/0/131070539/5879637.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/xiwidirufov.pdf
    • https://cdn.shopify.com/s/files/1/0464/7639/4648/files/bodmas_rule_in_maths_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/61642873197.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/buwumexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/ridun.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4657/files/87376562136.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/suzatikeziterisuwejibago.pdf
    • https://cdn.shopify.com/s/files/1/0445/6975/5812/files/40th_birthday_party_invite_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/90367973984.pdf
    • https://cdn.shopify.com/s/files/1/0440/1093/0341/files/imanage_worksite_server_administrator_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/84183984919.pdf
    • https://cdn.shopify.com/s/files/1/0438/2470/9782/files/vajatutodiduvafoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/lanavabi.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_off00005a07.bin
48c7aea80e0d82ce47b80d06fc32a5115607377508ba9868c0342bf65011968b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A07 5316 bytes
font_01_sfnt_off00006bfa.bin
65357f56d3cafcbd61c17952a8ef1c31f0e4dba832053a429721987e04d60117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFA 14856 bytes

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