Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d6d02023c16492…

MALICIOUS

PDF

42.7 KB Created: 2020-08-02 23:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1785d0c28a7ce429fbed929162667a10 SHA-1: e95240220c996feb9df4161f4ec4ab26e85c725e SHA-256: b9d6d02023c16492b41d91c6b4c48599332c8790d91af0a3eeb697b87a21b53e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=engineering+leveling+guide+vanilla'. The document body, though heavily obfuscated, contains text that suggests a lure related to an 'engineering leveling guide'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=engineering+leveling+guide+vanilla
    • http://files.bigfootodyssey.us/uploads/1/3/2/7/132712251/8993682.pdf
    • http://files.bestcarpetcleaningdavenport.com/uploads/1/3/2/6/132682723/xoxipot.pdf
    • http://files.team-music.com/uploads/1/3/1/4/131438299/tijavaren_rifulikevosivoj_tuzumosalumo_laliwibuvitamag.pdf
    • http://files.unitedfamilybenefits.com/uploads/1/3/1/4/131483266/wujiki.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/panax.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/84222387119.pdf
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/dnd_5e_samurai_xanathar.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/23388393974.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/sazopupasapezebapofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6293/files/gidazobedujif.pdf
    • https://cdn.shopify.com/s/files/1/0434/1697/7559/files/gujixosotefupu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/22495139649.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/wezinex.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/72268706644.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/college_accounting_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/56525679038.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/
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/sazopupasapezebap

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006997.bin
613c7747be50f5f7fa0652f9a2ae0a97718ec59311b97c44bf4f2e3df676a633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6997 4832 bytes
font_01_sfnt_off00007a24.bin
454f2be7a1de83ecc3d131472d5782057cdd612100b14d3d7adff0b709c22edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A24 10872 bytes

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