Malicious PDF — malware analysis report

Static analysis result for SHA-256 6856505fdb2c2dd0…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 14:50:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1434ebdf975b3870df6b533348e46c76 SHA-1: 1fb8949a8e9f64414ba3090affb656c583c2f22f SHA-256: 6856505fdb2c2dd08e300a7e21d4ec0f0aea7d7e6bb05dbe361db6902f5549f9
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is malicious, including links to known redirectors and a lure for game hacks. The document body and embedded URLs point to a phishing attempt disguised as a 'free generator' or 'game hack' for popular games like Roblox and Coin Master. The primary malicious URL is http://netcdn.tw/app/431946152/flame-hack-roblox-game-hack, which is likely used to deliver a secondary payload or redirect to further malicious content.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/flame-hack-roblox-game-hack In PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/youtube-how-to-make-something-on-roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/all-roblox-hack-scripts_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/rbx-fre-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/god-mode-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-girl-faceds_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/face-added-by-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-hacks-money_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-flood-escape-2_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
font_00_sfnt_off00002cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD9 21792 bytes
SHA-256: ad1aa231ade7a122dadef96f381e1873c22c2a6025c58d2d9b3d02aa4c55f298
font_01_sfnt_off00005d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0D 19080 bytes
SHA-256: 364e8c3e69dd5ddd2571108162b449f132cc82b4ae3cca26439fa338652aabfb

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