Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f8e2b52ae56785…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 16:44:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f6865f7d9836e6d94e68bb2a078eca4 SHA-1: dc112a05b31f86c0a3ae26f666fb20a2702706df SHA-256: e3f8e2b52ae56785a56a06efc3412aef428787a4d9a9cf56d283f5d0fa0ce5e7
160 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency and hacks to entice users. It contains embedded links that redirect to malicious infrastructure, which in turn serves further malicious PDF files. The ML classifier strongly indicated maliciousness, and multiple heuristics confirm the use of redirectors and lures.

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.tw/app/431946152/how-to-get-free-robux-games-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-gift-card-codes-2021-august_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-make-a-costume-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-a-private-server-roblox-jailbreak-for-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-today_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-accounts-2021-with-robux-may_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_off00003049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3049 22416 bytes
SHA-256: 7d58e2860402607b886bf8e347c04f27e3ff8cc660699c9f90ec3bb5dc7c48d6
font_01_sfnt_off00006225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 19244 bytes
SHA-256: b8c2daca9de1ad1f1abd6b245aca9824e0b7759a36d278cdc1c8b4996df9d835

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