Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28e340b7a8c9e16…

MALICIOUS

PDF

41.7 KB Created: 2021-05-14 14:11:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a2505b371fc42ee608d03ba70a323f40 SHA-1: 40d611e53c9fe8996eeeaedf7b2c7301cde0d95f SHA-256: c28e340b7a8c9e1679b0d186678316802a6d1093af788e36dae3cda2e1fc6feb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, identified as a 'link farm' and 'game hack redirect lure', pointing to websites that promise free in-game currency or hacks. These links likely lead to scam pages or malware download sites, aiming to trick users into clicking. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coinmaster-rewards-game-hack PDF link annotation
    • https://studentcareerinfo.com/images/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://studentcareerinfo.com/images/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://studentcareerinfo.com/images/coin-master-free-spin-link-today-download_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
font_00_sfnt_off00004afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFC 23804 bytes
SHA-256: 4f55cf138db9c4135f371b81aeb512e0cbe0b5cdfef1fb0bafe375308b39714f
font_01_sfnt_off00008117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8117 18144 bytes
SHA-256: 3304910cf416930b47305d75e02d2266dd9cc93df9b4dcfa32843af2f30c9813

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