Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc42862e322ddab…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 12:45:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 99396ac60ae92b279eaac0ab90e5f5a2 SHA-1: 3968168d89f15652c999e27d8491767d0ee8fcf3 SHA-256: 1cc42862e322ddab9cda33d6381b7b839fd582f33f8cd610db67f0e1e77b621a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and other PDFs, all promoting game hacks and exploits. The primary redirector URL, http://netcdn.tw/app/406889139/hack-coin-master-spin-game-hack, is flagged as malicious. The document body and heuristics indicate a lure for users seeking in-game advantages, which is a common social engineering tactic. No scripts were extracted, but the embedded URLs and redirector behavior are strong indicators of a malicious workflow.

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/hack-coin-master-spin-game-hack In PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-promo-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/appbounty-hack-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-roblox-expolit-that-kills-others_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-roblox-jailbreak-with_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-life-hacks_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_off000033f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F7 22912 bytes
SHA-256: 7a5776cee9138c0370b5c96a96c84b5c321c56089c163354b937350a207dee78
font_01_sfnt_off00006774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6774 18180 bytes
SHA-256: b0c69fb41316595c55bb75fd2f2f99b4f9c52d92968d5e259995507e4ea01459

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