Malicious PDF — malware analysis report

Static analysis result for SHA-256 1baaa8d0929bc619…

MALICIOUS

PDF

34.2 KB Created: 2021-07-07 23:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3623fe2c15ebd930ca3fa1c75f1c8868 SHA-1: f9d712a48b5196cb1147dc54ae6e46a4812b1488 SHA-256: 1baaa8d0929bc619e54e0b99e7b6ff96bc9abade62b3a8e5097328bb64fb77f2
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a workflow designed to lead the user to download or execute further malicious content, likely exploiting a client execution vulnerability.

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/robux-today-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-on-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-funky_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cone-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-tycoon-money-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/google-only-roblox-items-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-roblox-apk-mediafire_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-twisted-murderer-hack-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/script-hack-roblox-legend-of-speed_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-phantom-forces-aim-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cheat-blox-peace-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/mcpe-client_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-login-free_GM479516143.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_off0000308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308F 21864 bytes
SHA-256: 717c95a126e79a68b8d89e7d0079ce908c16bb78bcb7a6a5abbdf3c584140182
font_01_sfnt_off000060e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E3 18904 bytes
SHA-256: 2027c49f68bbeff3a315e031b7bcb34a95dd5d98227dd3ac67cfce58e7160adc

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