Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c59ea14785429a…

MALICIOUS

PDF

45.4 KB Created: 2020-08-04 14:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2346df4fb24816ba21d8c94209be58d SHA-1: 4d86a0715a1a3baf9dbbe5dd9d271fc404425fda SHA-256: e8c59ea14785429ab57c42eaa631878f653bf0a5d3ded78740e4f48785cbd361
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded URLs. One of these URLs, https://ttraff.com/pify?keyword=diffusion+and+effusion+of+gases+pdf, points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links indicates a link farm strategy, likely for SEO poisoning or to distribute further 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=diffusion+and+effusion+of+gases+pdf
    • http://files.westsoundquilters.org/uploads/1/3/1/6/131607062/ritozigapud.pdf
    • http://files.gilliancarmoodie.com/uploads/1/3/0/7/130739069/ninerofusukuwibosu.pdf
    • http://files.vancouvervolleyballleague.com/uploads/1/3/0/7/130739472/6944019.pdf
    • http://files.bigbucksfinancial.com/uploads/1/3/1/6/131606605/tonirodoxanod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72645751706.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/49757047145.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/47752385694.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/22499647883.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/88503039225.pdf
    • https://cdn.shopify.com/s/files/1/0429/7228/3033/files/unity_delete_player_preference.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/sijemiruremezofatidavol.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/94405443743.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/98203438887.pdf
    • https://cdn.shopify.com/s/files/1/0432/8469/3160/files/83489583315.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/58010603619.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/56749083005.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0964/files/17204668418.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/1/0429/7228/3033/files/unity_delete_play

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071d5.bin
8e267f27ed758da94f0863bba768627c327229a88ab98f62739c947beba11acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D5 5080 bytes
font_01_sfnt_off00008348.bin
486ff28a1c32a147bf07323c789f5bfd911bbe255c98e47e9a03b2fb3a9dc39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8348 10988 bytes

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