Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4393d1f924d906…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 08:40:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: de889708cf83bd6a33910ed114c9d6ed SHA-1: 11b885df27e74be19ac130c20cb3aace94ee3e75 SHA-256: 8f4393d1f924d906f8fc79bf1af143bded1ad0882ce60e68929506b3ccc7cbfa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that promise free in-game currency or hacks. The primary lure is "Free Coins Coin Master Hack" pointing to http://netcdn.tw/app/406889139/free-coins-coin-master-hack-game-hack, which is associated with known malicious infrastructure. The document's content and embedded URLs strongly suggest a phishing or scam attempt to redirect users to potentially harmful sites.

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/free-coins-coin-master-hack-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/fly-hack-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-gift-card-pw-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-codes-for-heavon-or-hell-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-on-roblox-rap-battles_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/pokemon-go-free-spoofing_GM1094591345.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/wurst-112_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-items-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-make-a-free-minecraft-account_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_off0000320a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320A 22164 bytes
SHA-256: 5a583c5b0824fa688e71e674d1d29877783e11f6584335ce798dbf116c81a363
font_01_sfnt_off00006316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6316 18168 bytes
SHA-256: 43e2e61e8dd74d9d7b73efa7f294753c283a217de09b7f0de140137b61c3d91a

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