Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1331ff03079cd40…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 10:08:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 05f1e42f4b3ebccb8a27c202884d430c SHA-1: 49e4b8edb46d3d6f4f92ddbfc62d5ca51e196dc3 SHA-256: b1331ff03079cd406bd74ebf0f47d3624d227f7001b2f8ccc4be86d841801048
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game-related cheats and currency generators. Several heuristics indicate these links point to malicious redirectors and a link farm, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.online/app/406889139/free-spins-and-coins-on-coin-master-game-hack In PDF document text
    • http://elib.acls-indonesia.com/repository/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_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_004_off00005170.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5170 24476 bytes
SHA-256: ddd9e9815a434e7fed5a8f282e1c5e04a408052f39c6da27f15139c72ab86464
font_01_sfnt_off00008974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8974 18060 bytes
SHA-256: 64690fddacb88a1b87eb78a3bf181b542b813998c8d2539429c7660090ba79fa

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