Malicious PDF — malware analysis report

Static analysis result for SHA-256 539acc6c557f7779…

MALICIOUS

PDF

43.8 KB Created: 2021-05-13 10:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 504c1caeecb086f0cdcdce82b085bb12 SHA-1: e7259c2ad2ee8abdf32340987b2aaa64efc8d16d SHA-256: 539acc6c557f7779fdc6481ee165eda8768177eeac281a099b4f86471fcca9c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector infrastructure, masquerading as game hacks and generators. The primary heuristic indicates these links lead to malicious sites, and the ML classifier strongly flags the document. The embedded URL and the document body content reinforce the lure of free in-game currency or cheats, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/roblox-generator-no-human-verification-game-hack In PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/microsoft-robux_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/hack-master-coin_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-get-free-spins-on-coin-master_GM406889139.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_off00004de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE4 25712 bytes
SHA-256: 715150ce5b711441dab5a38f930668ba53eb85eea9b6bd656a19e8e5eb2dddf0
font_01_sfnt_off00008750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8750 18772 bytes
SHA-256: d79baf027547f44448cd8f3b6712cdcd19f331e765a1a7a1a1aa24219739a308

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