Malicious PDF — malware analysis report

Static analysis result for SHA-256 698640dc859c85fc…

MALICIOUS

PDF

34.7 KB Created: 2021-07-08 10:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: be9ce9050453e341f6f39850d6f1106d SHA-1: 63eb21cca8cdf84e73d459f922a5334ac8f7257c SHA-256: 698640dc859c85fcc839b6248aa9d58ef44b171373f91378041dd00578046115
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of game hacks and free items to entice users. It contains a direct link to a known malicious redirector infrastructure, which in turn hosts a large number of SEO-optimized PDF files. The document body itself contains the primary redirector URL and numerous other links, suggesting a coordinated effort to drive traffic to potentially 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-raid-hack-game-hack In PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/get-free-spins-coin-master-link_GM406889139.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/roblox-cheats-and-hacks-download_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/dex-20-free-download-roblox_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/roblox-phantom-forces-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-likes-on-tiktok-no-verification_GM835599320.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-robux-code-jpg_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/roblox-2-download-free_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/roblox-hack-client-free_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/roblox-pet-simolator-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
stream_002_off000031d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31D8 22812 bytes
SHA-256: 6f7295f644816dbfaf4f86c041ad363ca1507426771de4f8355f953e939af354
font_01_sfnt_off0000651a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651A 18180 bytes
SHA-256: a1d2185dee36d53b147e12cd8be4f8bcbae1ec15da72c02b630d04b80fdb421f