Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a1a5755d4b52ed…

MALICIOUS

PDF

35.9 KB Created: 2021-06-20 06:20:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1c80ffc673c85881d2add609b3acf362 SHA-1: 37d0090435231ffdeabe4f775068fbddbaf6fd82 SHA-256: c9a1a5755d4b52eded282f517cc93a15412690bb6e30efab0931785c4ba226e8
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 0.9980

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 http://netcdn.co/app/431946152/free-robux-hack-2021-april-game-hack PDF link annotation
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-add-roblox-badge-for-free_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/cicada-wings-roblox-free_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/hack-shrek-roblox_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/roblox-dungeon-qeust-free-carries_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/mcpe-client_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/minecraft-hack-app_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_off000032a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A3 22676 bytes
SHA-256: a5621ce983db9ec3e76ea2fd8e1c7bab1dd7f119a1d7582b62568ed5349ebd16
font_01_sfnt_off0000659e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659E 19656 bytes
SHA-256: 0f733da9e6af6d4815fde5a27367a5f352296f8176dbfa59a117634551bdb7b8

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