Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df848c717d4bb69…

MALICIOUS

PDF

45.6 KB Created: 2021-06-09 12:46:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: edd16336582eeb22a75d4569823f022b SHA-1: 146dbacff6db9511febf39a6595a24174e969307 SHA-256: 7df848c717d4bb696ab0cfee63467f6df1c4bfc6cc4ddc8e3491939e1c9468d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising "free Robux" and "game hacks". The document body, though heavily obfuscated, contains references to these lures and the malicious URL. The presence of embedded JavaScript, though not directly analyzed for payload, is often used in such PDFs to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-robux-967k-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/cheat-roblox-android_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/my-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-admin-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-vehicle-simulator-money-hack-download_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_off000051c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C4 26848 bytes
SHA-256: aecef1d27674bb1a1a9a7e2b4e1b061db425269de30339e0d37e00ce838e5e66
font_01_sfnt_off00008eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAC 18572 bytes
SHA-256: 3e518b9306668576046efdffad0584f580ad157460f47cba7725d34feccad8c1

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