Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8124f5b220d99d3…

MALICIOUS

PDF

39.3 KB Created: 2021-05-10 11:02:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 810de7239b5865f85927cc055b22e971 SHA-1: 8174656e8fe4163ac572b9020d2f2213a6872a42 SHA-256: c8124f5b220d99d34a7c38321aec5f4f5c9d21f32441d35c806ebc7d1dcdb864
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a malicious URL. The document body also contains text and a call-to-action related to free game accounts and a generator, reinforcing the lure. The embedded URL is known to be part of malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.xyz/app/431946152/free-roblox-accounts-with-robux-that-work-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000332b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x332B 24588 bytes
SHA-256: 1c53d5e48c0ca9fa53995a2f293df9887962cab7b56dd3600f7ad855c4841c6a
font_01_sfnt_off00006ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB6 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7468 19476 bytes
SHA-256: 4c7cb67921980cc467a624d7be0aa4f8f19dcdcb8d4cb789adc94de6f70366aa

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