Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1bb56e17a6c614…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 12:57:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ee9a2801d9198e07efa46e8f44138929 SHA-1: 6e9b6ca2c400214fa7ca344f93fbf03070e642ca SHA-256: bf1bb56e17a6c6144f2fffbcc4580fbd2fd89a4764728fe27a65dc7b372f29ff
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on them by promising game hacks and free in-game currency. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or SEO abuse tactic. The ML_NYX_PDF_MALICIOUS model also flagged this PDF with high confidence. The document body contains a primary URL that appears to be a redirector for game-related cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/406889139/how-to-get-free-spins-on-coin-master-2021-links-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/como-hackear-roblox-con-cheat-engine-68_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-hack-no-scam_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pubg-uc-purchase_GM1330123889.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pokemon-go-hack-version-free-download_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-cards-that-works_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-backpack-code-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-exploit-roblox-auto-updating_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/raindrop-free-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/fast-car-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-free-download-android-apk-014-0_GM479516143.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
font_00_sfnt_off000031aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AA 23000 bytes
SHA-256: b1a33a36068ffa51781179432681208f17af8cdd7f68c16e8592e8b1d1dfce95
font_01_sfnt_off00006501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 18908 bytes
SHA-256: 7dda66289ac24dfe5727972179a9888d25dfab01e444e3a9b26cf9110a01f858

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