Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91cfd93cb192aed…

MALICIOUS

PDF

45.0 KB Created: 2021-06-08 18:43:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a27ac05e9ab78a60e732443363f1b638 SHA-1: 2bbbee4d1c6b1709bbbd80bc0682e3dd23e5eb1c SHA-256: a91cfd93cb192aed95cda7d5d3bac29e2035efdf839e8e2b233e56afeae96075
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 0.9865

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.tw/app/431946152/red-roblox-shorts-free-game-hack PDF link annotation
    • http://nebraskahospitalityhalloffame.com/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/robux-survey_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/tiktok-fans-for-free_GM835599320.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-spin-link-coin-master-today_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_004_off0000519c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519C 25468 bytes
SHA-256: 9d0de7ac377220d1ab9d1102615409fcb5d6cc2004538b305a8d751b905c894d
font_01_sfnt_off00008d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1E 18392 bytes
SHA-256: 6bb0f36535c9f71ab30324ef84b39e02c4276b4db0efeb0487c18a7a24103d9e

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