Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ff250c1999f456…

MALICIOUS

PDF

38.0 KB Created: 2020-08-01 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67686ec88dd46e4a536aa9eae5cb037 SHA-1: 382fcfedbf9afa62830a6b06c48cbd31210433ea SHA-256: 79ff250c1999f45658b2f5b6c7f6a943c1e515a926da76c174c666b06cf9bce2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. No scripts were extracted, but the primary malicious behavior observed is the redirection to a potentially harmful URL.

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=partial+differential+equations+strauss+solutions+pdf
    • http://files.barnbridgehill.com/uploads/1/3/1/3/131380814/maluluko_duwazimume_vadujezax_nonotibus.pdf
    • http://files.sunkistborderterriers.com/uploads/1/3/1/4/131406149/rapibajonutam_nawokuwe.pdf
    • http://files.cascadecavaliers.com/uploads/1/3/0/9/130968961/8732006463.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/61405163578.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/tevasotaleko.pdf
    • https://cdn.shopify.com/s/files/1/0433/9885/6867/files/2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/pefunuxutuwep.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/pevipab.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/93266839858.pdf
    • https://cdn.shopify.com/s/files/1/0434/7383/0048/files/bawedowididizutilolo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/22111249308.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/difference_between_analog_and_digital_computer.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/skyrim_anti_crash.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/jibanebisupepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/74415702770.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/wuxamefowafovopawamezido.pdf
    • https://cdn.shopify.com/s/files/1/0432/8554/5124/files/89440617718.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_off00005791.bin
b23bacd9e425fd5211d78ed4bb187a3a5d1edd777d4181b6d93c9121ff1b9768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5791 5164 bytes
font_01_sfnt_off0000692d.bin
e6d02fec759cfc83fa078330d6b3733eb75772a5e0fe56aa132e190d19292c83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692D 9824 bytes

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