Malicious PDF — malware analysis report

Static analysis result for SHA-256 8add3c9762e989f7…

MALICIOUS

PDF

33.7 KB Created: 2020-08-06 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12fc9821d407702e68aaeeafa0a49487 SHA-1: 6b2312567ce8b24795ac989d643f47f834b8f850 SHA-256: 8add3c9762e989f75e9e1fa3084f59911482ee7a710b2847bfd8446d00e6fb5d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.cc. The document body, though heavily obfuscated, contains the same URL and a large number of other URLs, many hosted on Shopify, suggesting a link farm or content-scraping operation. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to a malicious URL via a deceptive link.

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.cc/pify?keyword=arabic+alphabet+writing+practice+worksheets+pdf
    • http://files.artbysaroum.com/uploads/1/3/0/8/130813714/1308032.pdf
    • http://files.saltnextgen.com/uploads/1/3/1/4/131406344/seditavatevoxofi.pdf
    • http://files.kristamasonyogafitness.com/uploads/1/3/1/3/131379439/tukozadisi.pdf
    • http://files.masterautolift.com/uploads/1/3/1/4/131437005/5641772.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/fisicoquimica_castellan_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/32888200961.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/warugojuroxegobarovotujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/9974965756.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/85227261173.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/xanuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/hp_officejet_4620_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/uc_davis_timesheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7079/files/nfl_schedule_week_14.pdf
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/zejafukopaleg.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/69691302904.pdf
    • https://cdn.shopify.com/s/files/1/0447/8667/9965/files/cube_world_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/wooden_jewelry_box_plans.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/jukidewi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004797.bin
9b4a7393083df35cdde8632c31d0aeaffcae8648844c08668fb663d06f2cc6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4797 5700 bytes
font_01_sfnt_off00005b03.bin
bd02e7b6580854bc463eebe42f32588f2e5224730a2945a1bdfd14e0b51c981e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B03 8920 bytes

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