Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cddc8f1497ab5a…

MALICIOUS

PDF

46.3 KB Created: 2020-08-06 17:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc141964068177e2a4dc39655f355221 SHA-1: 3bf398522a3d95ccc98ca1b9b3cdda39c370cddd SHA-256: 95cddc8f1497ab5ac80826ba16d5ffacbbf921ffeaabcd2704733f83ebd48a88
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets. The presence of multiple Shopify-hosted PDF links suggests an attempt to blend in with legitimate content while directing users to malicious infrastructure. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=adding+and+subtracting+positive+and+negative+numbers+worksheets+pdf
    • http://files.stampgeneral.com/uploads/1/3/1/1/131163516/zikakakezit.pdf
    • http://files.annasophiefit.com/uploads/1/3/1/4/131406811/b299d.pdf
    • http://files.marilynoconnell.com/uploads/1/3/1/1/131163733/jerexonesolag.pdf
    • http://files.heroesruel.com/uploads/1/3/1/4/131408970/6110137.pdf
    • http://files.award-film.com/uploads/1/3/0/7/130776266/2664673.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/nejez.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/jam_exam_syllabus_for_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/42203637508.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/vawawafugufafabapefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6880/8613/files/75544995360.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2060/files/48915566971.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5332/files/kibokofizofa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/66277685211.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/18475102677.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5754/files/55168978864.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/58290850044.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sikotifukiv.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/1/0428/9835/8432/files/16711599054.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073a3.bin
51fd56b2d662a893c5174db20277bc3ecfe931eb35ed94955356214c483b13cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A3 5884 bytes
font_01_sfnt_off0000879c.bin
60ca855dc163b59957c0dcf6a35a0f0bf061b5f05acaa4639203088d9c893512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879C 10300 bytes

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