Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57e690996f85198…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 04:35:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ba58c908d116301a75845efdb4424a1 SHA-1: b761fb4de7cbc0ec9becadda45d37d299a2079f8 SHA-256: b57e690996f851988d046a7dbe33e9ef82aee31690274c4ab04377d405264049
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and free coins for games like Coin Master and Roblox. The heuristic firings indicate that the PDF links to a malicious redirector and uses a lure for a game hack generator. While no scripts were explicitly extracted, the nature of the links suggests a potential for further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/coinmaster-spins-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-autohotkey-roblox-piano-player_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-cheat-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-exploit-that-lets-you-use-gears_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/all-the-free-clothes-in-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/comment-cheat-les-robux-ilimit_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-rocitizens-money-cheat-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-real-robux-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/quick-robux-hacks_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/www-bloxburg-club-free-robux_GM431946152.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_off00003051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3051 23176 bytes
SHA-256: 78a9dca0b36769cde9edb842bc30c6caa5cd632ac44a5e1534dbf32b4115eac9
font_01_sfnt_off00006476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6476 18272 bytes
SHA-256: d8860f67db87af1b46a3a45b3a8e2386644db7fe5acd3d6d31060df5d7f9a248

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