Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1a0612cf83acc8…

MALICIOUS

PDF

34.3 KB Created: 2021-07-08 23:48:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9d81ce31577a9a377c32fdc3279fb3bd SHA-1: e8cf0c7a4237fc6743cd3fb9b5226a1c9e7f880f SHA-256: 7c1a0612cf83acc807d19ae1f49c9cf0cb9c5238c7384a76570dd18f79db511f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of free game items and cheats to entice users to click on malicious links. The document contains numerous links to redirectors and a link farm, indicating a phishing or scam attempt. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-free-pet-snacks-game-hack, which is associated with known malicious infrastructure.

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-free-pet-snacks-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/welcome-to-farmtown-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-adidas-hoodie-free-template_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-and-limiteds-hectic_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-hack-one-app-rewards_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-para-tener-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/quelle-est-ladresse-des-robux-dans-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-trik_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-promo-codes-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-minecraft-for-free-on-tablet_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
stream_002_off00002f58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F58 23080 bytes
SHA-256: 1036749312517a87164281a0bad41dd81edb40b6ad4a90f2cb07b6a2bba41baa
font_01_sfnt_off0000636f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 18320 bytes
SHA-256: 70b721ff8e84e5e3b63fc5a4a42e5159d74764d5659d2c470f477e43d1d853e9

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