Malicious PDF — malware analysis report

Static analysis result for SHA-256 443f30dcbce83425…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 14:12:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ace5dfba288c399d40da42f24bfcf49d SHA-1: 7cfc61ffc3dbe8c7d2b871b074bede9050d7ecc7 SHA-256: 443f30dcbce834259a86633a41da67d59f51684243c40e3b5f8ded7c8b8bc2a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure and sites offering 'free Robux' or game hacks, a common lure for malicious downloads or phishing. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a redirector link designed to trick users. The embedded URLs likely lead to further stages of the attack, such as downloading additional malware or directing users to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-exe-game-hack In PDF document text
    • http://fobh.net/userfiles/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/pubg-mobile-uc-qatar_GM1330123889.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-ben-10-free-download_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-hack-us-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-items-in-roblox-games_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-minecraft-windows-10-with-java_GM479516143.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_off0000320b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320B 22368 bytes
SHA-256: 9968cabe03401e07a904ecfa88ee13820955968b1c05d93df34985330ca81764
font_01_sfnt_off0000639b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639B 18716 bytes
SHA-256: d879526d17834eef7ec53fa1f2e94fc6027c3862d934ab81bb2be8c7d2c4e18b

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