Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc13c1ad42446bea…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 13:33:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d0ac8147b6319da80e4388314c014784 SHA-1: 0370f5287f080e0862eeea2be6cbc2bb075ebf73 SHA-256: bc13c1ad42446bea23bcdaebedba7924f8c067d5b8510f5c32ca7a4f548832a7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure at 'http://netcdn.tw/app/406889139/coin-master-links-to-free-spins-game-hack'. The document body and heuristics indicate a lure for free game items or hacks, designed to trick users into clicking these links. The presence of a visual download button further supports a deceptive workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.
  • 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/coin-master-links-to-free-spins-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/www-robux-tv-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-only-code-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/can-any-codes-give-u-free-robux-2021-working_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-robux-for-free-no-human-verification-ipad_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-cheat-engine-2021-may_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-from-a-white-hat_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/legit-free-robux-games_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pastebin-roblox-free-obc_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-hack-download-for-pc_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-arcane-adventures-hack-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-a-game-in-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/v3rmillion-roblox-hack-script-fnaf_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_off00002e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E07 23000 bytes
SHA-256: 5c7d4e668084648e84f0dfe1e9832a157ed134ab33a86ced507290c8f5c1c591
font_01_sfnt_off0000619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619B 18344 bytes
SHA-256: 8c6747682b97d7044a50dfe25eec500f123ad83a8e365e01e27cac4c7ce102d6

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