Malicious PDF — malware analysis report

Static analysis result for SHA-256 4615558c8438b732…

MALICIOUS

PDF

34.5 KB Created: 2021-06-25 14:25:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 08a14870cbc6a7dcdbea2920a72efa6b SHA-1: 5487a52dcdafbbf2c7d5604f2e8d48ee2653e4ee SHA-256: 4615558c8438b732d90c7cee2c3665f16f7a81b16d89e31342c835664e11e88d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites and other PDFs, masquerading as generators for game hacks and cheats. The heuristic firings indicate that these links lead to malicious redirectors and a link farm designed for SEO manipulation. The document body, though partially corrupted, contains URLs that align with the lure of obtaining free in-game items, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-make-hacks-with-studio-roblox-game-hack In PDF document text
    • http://pustaka.bbppketindan.info/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/tix-factory-tycoon-paquet-tix-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-download_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pubg-uc-new-freepik_GM1330123889.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
font_00_sfnt_off00002f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F33 21772 bytes
SHA-256: fef22417d99c920613037fe00ec10fd26a899f269067a206ac750ac94d1be05d
font_01_sfnt_off00005f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F16 19920 bytes
SHA-256: b17d152d5b30e4f3df359c51f3743920d137dfdb51cfae8595c3578542d0f4ef

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