Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca51e0c87b18c20f…

MALICIOUS

PDF

34.5 KB Created: 2021-06-28 23:20:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0542fd859f74b4926c3559e8ebd49884 SHA-1: bb0e8e7d175e0f6b1caf5292d74e4de7ea39c72b SHA-256: ca51e0c87b18c20f55e0b69feb8344d6323596884e14af3ae830b7c6110bc707
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to websites that are flagged as malicious redirectors, specifically targeting users interested in game hacks and free currency for games like Roblox and Coin Master. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or malware. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or malware distribution scheme.

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.co/app/431946152/roblox-free-robux-games-that-work-2021-game-hack In PDF document text
    • https://tena-g.hr/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-star-wars-group-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-milenari-headphones-free_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/dll-files-for-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/one-app-rewards-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/prison-live-on-roblox-was-hacked-in-deutsch_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/download-roblox-go-through-wall-hack_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_off00002e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E58 21892 bytes
SHA-256: 37fc111a4013626b062f7f8b2bb82ec5517c53223f098817dec7c40aafb693e5
font_01_sfnt_off00005e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8E 20088 bytes
SHA-256: fb9c9d1dce6ec4e4ab82bbaf970694cfc93cd5bd0ab6ff58384ba865f4b5a37a

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