Malicious PDF — malware analysis report

Static analysis result for SHA-256 85de1dfbcb9fa19f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-19 17:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d83d204943915b359b49502b88a45ef5 SHA-1: a7da0cbd0f9a349de7b359530680a2a033fa79c0 SHA-256: 85de1dfbcb9fa19f56580092e350646fa2c4f647041720350e6bc5577f86d3b3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The primary malicious URL is used to redirect users, likely to a phishing or malware download site. The ML classifier also 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=automotive+repair+business+plan+pdf
    • http://ziniruka.michelleridnerphotography.com/uploads/1/3/1/4/131406082/rudimokelav.pdf
    • https://cdn.shopify.com/s/files/1/0435/7718/0328/files/sidhu_moose_wala_bohemia_punjabi_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/becoming_supernatural_joe_dispenza_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/phoneme_worksheets_year_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/30637030841.pdf
    • https://cdn.shopify.com/s/files/1/0435/6128/7839/files/jarisexodenakevexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/gugonivigunavenig.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1253/files/20233213351.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/ribofoxezavudutafelud.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1813/files/bronkopneumonia_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulanevu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef5.bin
2efb85885b437732f00f304155d4627aed4aa84d1157892597919cba04382321
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF5 5256 bytes
font_01_sfnt_off000070b3.bin
36c389f3a72eba3440895485ed083af40da541f78c2965380ae3d874f748785a
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 10480 bytes
font_02_sfnt_off00009468.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9468 4324 bytes