Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1360b3bce33cd1…

MALICIOUS

PDF

46.6 KB Created: 2021-06-04 04:13:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ec45de39056ca348691d2f37e804b80a SHA-1: fab4d7a574fef4c345033d00fee4969c15c21b72 SHA-256: 4d1360b3bce33cd157e8580dac86c281770994976d4cc7fa948ed36f96fe429c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic indicating it links to a 'free generator / game hack' lure, specifically pointing to a URL that promises Coin Master free spins. The document body, though partially garbled, contains the same URL, reinforcing the lure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a social engineering attack to redirect users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.online/app/406889139/how-to-get-coin-master-free-spin-link-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DF 24920 bytes
SHA-256: e0ed337296d74da99126874c3cbd31d83f0bcc5dceb9cfa7e67984f728d124ea
font_01_sfnt_off000089df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DF 2820 bytes
SHA-256: e5f6ec650849eefe6bc6a1649c2875ce35328d23e4196945bba66cc43e5a49d4
font_02_sfnt_off0000937d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x937D 18220 bytes
SHA-256: b2f7f6595bf64a30853f7d52e44db90316d94cc0a70445ac6854799e3a79afd4

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