Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bf8cab5330c043…

MALICIOUS

PDF

36.5 KB Created: 2021-05-22 12:16:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 43152872dd458386ae405c2391b9be56 SHA-1: 29341c1546564c13bf16d20402d15ce3caec6fa4 SHA-256: 31bf8cab5330c043a80297cc4e47cd60fba36c21b49a16afb3a455198de66393
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 0.9492

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/431946152/roblox-hack-game-hack PDF link annotation
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://man1kotasmi.sch.id/__statics/gudangsoal/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003352.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3352 26380 bytes
SHA-256: a4c5013dcbe471dc4b74a2aec7be6f53e98820c9e812d8be3b4c7cf472e2eb12
font_01_sfnt_off00006da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA1 18184 bytes
SHA-256: 1e306c7abfe58da704748ef58ff750010dbbd803bf497203b0bed85dd8d0d5c5

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