Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f252c2bbe9fc4fe…

MALICIOUS

PDF

39.0 KB Created: 2021-05-23 19:33:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7ecce63f5a186957d50d1d3129103aae SHA-1: 2c47ea8396bc087b123e60ae7401d922b9026d1b SHA-256: 1f252c2bbe9fc4fed7749785b156a860fac54df1ad2c8bc71cf7f5752f9c72b0
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a primary lure pointing to a 'coin-master-free-spin-codes-game-hack' page. This, combined with the 'PDF_GAME_HACK_REDIRECT_LURE' heuristic, strongly suggests a social engineering tactic to trick users into visiting malicious sites. The ML classifier also flagged the PDF as malicious, increasing confidence in this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/406889139/coin-master-free-spin-codes-game-hack PDF link annotation
    • https://hphelmet.vn/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://hphelmet.vn/ckfinder/userfiles/files/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • https://hphelmet.vn/ckfinder/userfiles/files/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://hphelmet.vn/ckfinder/userfiles/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://hphelmet.vn/ckfinder/userfiles/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn 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_002_off000034d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34D5 24908 bytes
SHA-256: f4700a77c4e653954445cbe17397ba6ff2322371752c4dfb69d94a8b239bb078
font_01_sfnt_off00006dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7787 18060 bytes
SHA-256: 6c6954b9f81c735a5c4580de4c42457a99792272849cec4d30b191d18cdb5601

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