Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd0e8c881dee866…

MALICIOUS

PDF

34.5 KB Created: 2021-06-29 17:44:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5ed9f341dd6ef6eecd91db4a61a8a7b5 SHA-1: 6a742d6d499decca6c259dddcb7059ba2a22abf0 SHA-256: 1bd0e8c881dee866f230b8b4807ce1b152cbfe3e05a4036bf5b1500a6c9ee2e7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links disguised as 'free generators' or 'game hacks' for popular games like Roblox and Minecraft. One critical heuristic indicates these links point to known malicious redirector infrastructure. The document body reinforces this by directly embedding URLs that promise free Robux and game cheats, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.co/app/431946152/how-to-get-free-robux-on-computer-no-survey-game-hack In PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-escape-room-cheats_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/como-hacer-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/cheat-dungeon-quest-roblox-20s_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/counter-blox-roblox-offensive-cheats_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/hack-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/epic-turtle-plays-free-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-exploit-roblox_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_off00002e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0D 22468 bytes
SHA-256: 8151bd4fd6f94fe1877957f7b9457a25d6f38614fa9c5f54f518f6ea16b3d146
font_01_sfnt_off00005fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE5 19716 bytes
SHA-256: 315750ac22c7df6513fa318d4538b7b615e003529f3d0d204d02636b64a1bf14

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