Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1438af21b61bb2…

MALICIOUS

PDF

36.3 KB Created: 2021-05-22 07:38:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2fc55263baed0bedf2ab74780e148014 SHA-1: 1e15c44e483da3630081d1e6fce8a4eeeb54cc82 SHA-256: 8b1438af21b61bb2a4129fe9a0701120ecb83f5289118496ee62532aa01d64d5
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites that promise free in-game currency or account benefits, such as 'free tiktok fans' or 'robux generator'. These links are likely part of a phishing or scam campaign designed to trick users into visiting malicious sites. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/free-tiktok-fans-no-human-verification-or-downloading-apps-game-hack PDF link annotation
    • http://www.sfakia-online.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D9 23704 bytes
SHA-256: aaac31711b09abb8198946033825be6e0ed8e9abb46098a778084d2dedf4e112
font_01_sfnt_off000069c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C9 19260 bytes
SHA-256: c23abd5df90a5b7093cc3e198b5bcaea5ee7ff11a274e14c679da15d1a345c21

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