Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c94a5d6d453f460…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 14:09:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d2a66551a23f396d228b9be70be34e1b SHA-1: cf34b2d3a9e8f94eec9268668161a20d0baaa81a SHA-256: 2c94a5d6d453f460fd29ee4390139b0912733d344f3d54eada48f605c78d16e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains multiple links to redirector infrastructure, including http://netcdn.tw/app/406889139/coin-master-hack-online-pc-game-hack, which is flagged as malicious. The document body and embedded URLs suggest a phishing or scam attempt aimed at tricking users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/coin-master-hack-online-pc-game-hack In PDF document text
    • http://lib.icbc-indonesia.org//repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-new-cheat-engine-bypass_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-500-robux-quiz_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-braces-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/i-ot-free-robux-for-playing-this-game_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-azure-mines-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/dungeon-quest-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-how-to-get-free-clothes-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-no-human-verification_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
stream_002_off00003226.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3226 22884 bytes
SHA-256: d53b23b4c76b333973df753bbbd9205163006cc19a84f3d7fd8a257b0c211fd5
font_01_sfnt_off00006586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6586 18232 bytes
SHA-256: 2e126d135fd472f17e04e2c2670c366e67c2359c8a974fc9d6678d50609a09dc

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