Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2a6b6d1d848d94…

MALICIOUS

PDF

48.3 KB Created: 2021-06-13 17:23:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 470f64800c7a2759b11030cc800b9f85 SHA-1: e8fe8d67d8063400a096916d499a5014e62dfb59 SHA-256: ff2a6b6d1d848d942bd8e6931fc35e5469518d41f258def082702ee85d2fa8b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for 'Free Robux Gift Card Codes 2021' and embeds a link that redirects to malicious infrastructure. This indicates a phishing or scam attempt designed to trick users into visiting a potentially harmful site. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.co/app/431946152/free-robux-gift-card-codes-2021-game-hack In PDF document text
    • http://library.acehresearch.org/repository/awesome-free-accesories-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-girl-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-codes-2021-october_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-actually-get-free-robux_GM431946152.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_off00005221.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5221 31204 bytes
SHA-256: f3eb32d833b66411822056674d172541fe20587e82fb5a01dc947495c8c17918
font_01_sfnt_off00009800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9800 19044 bytes
SHA-256: a83203ba6d4d8e4db234da74518c811315008a13a6a61ff598d06d89853e7c2b

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