Malicious PDF — malware analysis report

Static analysis result for SHA-256 d803f530e62d8dd0…

MALICIOUS

PDF

49.1 KB Created: 2020-08-25 01:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207013c8852b8c4cbfe53b4be0369d47 SHA-1: 117f05fb5df8c33519c3ea8146b78656a2aa2487 SHA-256: d803f530e62d8dd0b7bf56cd66973dcead5240af467c2b31fb72df868876eb93
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL points to a redirector service, likely intended to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs hosted on Shopify, suggesting a link farm used for SEO poisoning or to host malicious content. The ML classifier also strongly indicated maliciousness.

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=bmp+ka+full+form+kya+hoga
    • http://files.vo2maxcycles.com/uploads/1/3/1/4/131437669/7173265.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/bard_guide_5ed.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/saxutuludilazapapi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/vokiximik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/26982909333.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9447/files/titedilujevovutegonuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/96280445363.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/8281729236.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7913/files/65372921695.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/cursive_alphabet_chart_with_directional_arrows.pdf
    • https://cdn.shopify.com/s/files/1/0449/3164/5608/files/velaweguzojo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/rijatoputeruwitewuzi.pdf
    • https://cdn.shopify.com/s/files/1/0462/1854/3258/files/whatsapp_status_song_new.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b7.bin
fab24bb9f2983a1ed9e3ab29299c4f4ef8640d5183eebc3543af5e5fb2badd0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B7 5352 bytes
font_01_sfnt_off000062d6.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D6 3720 bytes
font_02_sfnt_off00006e3a.bin
f9034c4a3ad9ab1703e788c08b19462e64ff5ea170b9001cda993de109381bb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3A 13664 bytes
font_03_sfnt_off0000993e.bin
b72556366278a44cf4b0b8a1c4ec6a0d89cfc0aeb9b39e590b718c6a8fb1bd3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x993E 8512 bytes

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