Malicious PDF — malware analysis report

Static analysis result for SHA-256 996d43f254e9a677…

MALICIOUS

PDF

45.5 KB Created: 2021-06-07 20:34:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1632ebc8536e153263eb63921c0c5350 SHA-1: 3c128545fc9d38f86392592c24accecc54157274 SHA-256: 996d43f254e9a6776d6379e892e05784ffcee9126fc9be56c390abb8a5b8a338
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators for popular games like Roblox and Coin Master. The presence of a 'free generator / game hack' lure and a large number of external links strongly suggests a link farm or scam operation designed to redirect users to potentially malicious sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-free-robux-limited-edition-game-hack PDF link annotation
    • http://sv-nahetal.de/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux_GM431946152.pdfIn PDF document text
    • https://www.roblox.coIn 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_off00004ff8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF8 27120 bytes
SHA-256: 734f74eca24163fb2aa008e5e1129df70f16183958f3d8d5dbd8a5419256d444
font_01_sfnt_off00008e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0D 18748 bytes
SHA-256: 4c7d2d3bfcbcfb61e40dde9ca0f594549b6e0c51be583bb4c104e32c1e00be07

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