Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fb8feb0c5b2efd…

MALICIOUS

PDF

39.0 KB Created: 2021-05-23 14:38:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb71f33020e20db43a542aa82b97fdd6 SHA-1: 98b677f88cc4802a2ffcee17f262e2905ba3f48b SHA-256: d5fb8feb0c5b2efd721697e9dfc93443531fcdd7d34aceb3f5a39e2035b11528
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/479516143/classic-minecraft-net-hacks-game-hack PDF link annotation
    • http://instrutech.co.th/images/get-more-robux_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/free-coin-master-spins-blogger_GM406889139.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_off000034c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34C1 25520 bytes
SHA-256: dc3406547ae2b35291dc28ad2b76d7b9120d615983abf9e04d4fbb655769926f
font_01_sfnt_off00006ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBF 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7871 17812 bytes
SHA-256: 06eb0692cb0ff670c8084f221f19fc536b6b0c4a84b00058b05a05adc7fae17c

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