Malicious PDF — malware analysis report

Static analysis result for SHA-256 633b1adcd35911b1…

MALICIOUS

PDF

45.8 KB Created: 2021-06-10 17:44:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b0cb08bbada69dccfc927eb804c19d94 SHA-1: 37c4beaf692684f233c7fba397eca21fdfe7e093 SHA-256: 633b1adcd35911b184d2d6c43c33759bc775c2b0d596acc8e07214d09fa00038
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting game hacks and cheats. The document body, though partially corrupted, contains references to these lures and embedded URLs. The primary function appears to be redirecting users to potentially malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 https://netcdn.tw/app/431946152/roblox-blox-no-hero-level-cheat-game-hack In PDF document text
    • http://bgnails.nl/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/robux-offers_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-hack-roblox-money-on-ipad_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/pubg-mobile-uc-2021_GM1330123889.pdfIn PDF document text
    • http://bgnails.nl/images/free-tiktok-likes-no-verification_GM835599320.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-daily-free-spins-blog_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_off00004b2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B2A 24976 bytes
SHA-256: e841a94febaa106732b186820d546f741f6f7898b611415aeb044649675574f7
font_01_sfnt_off00008536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8536 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00008f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F62 18396 bytes
SHA-256: 5eb17e7c84be05129b78b75bbdf91862afba2c24bac17b1414833c01abb05831

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