Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fa92603ac47ec1…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 20:33:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 17a4556efa4daaeec0a6a7bd69cc79ef SHA-1: 864f7f3790c1c9f75cb853f1f458e10beee8ad8b SHA-256: d5fa92603ac47ec1928ec175f92035b4ae8ccd86c801e604481cc00e9baffcb5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and potentially malicious infrastructure, disguised as game hacks and generators. The heuristic firings indicate that the PDF is designed to lure users into clicking these links, which likely lead to the download of further malicious content. No scripts were extracted, but the embedded URLs and redirector links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/free-spin-coin-master-2021-link-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/pubg-uc-generator-2021_GM1330123889.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/earn-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-websites-that-work_GM431946152.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_off00005197.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5197 25460 bytes
SHA-256: 16e199ddf43b13fd3439a9a41cdcb8e77b66dbbd6882efbc2816b3fd46dc9783
font_01_sfnt_off00008b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B49 2920 bytes
SHA-256: 64c53edae7920bc04119553d13e7f88c7ab8c9d6abd0f5e62be35afdb33f76ff
font_02_sfnt_off00009564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9564 18456 bytes
SHA-256: 7500aca679d0fadfbda1e17cf023a195ee80a601fef81e7f7ced8cf50182af56

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