Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d39e3f14fca021…

MALICIOUS

PDF

31.6 KB Created: 2021-07-04 09:06:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 293e3e8ac87b29f0a4a9fcd8d2041cd1 SHA-1: ef1a0ac9582eceefdd9bb4ceb2d1b560fcc0e380 SHA-256: e6d39e3f14fca0214ea31b35cccf4ec92e6bc56e8bf65739e604d3b147872660
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external sites, including a known malicious redirector at http://netcdn.tw/app/431946152/how-to-earn-robux-game-hack. The document body and heuristics indicate a scam related to game currency and hacks, likely intended to lead users to phishing or malware download sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/how-to-earn-robux-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-limited-offer-game-answers_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-that-thing-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-how-to-hack-in-your-game-hack-gui_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-welcome-to-bloxburg-money-cheat-july-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-counter-blox-esp-aimbot_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_off0000299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x299E 21172 bytes
SHA-256: 993b716342eaa759820ca144e6075accc82647662c3225402d55e2f43ffd751f
font_01_sfnt_off00005794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5794 18716 bytes
SHA-256: 530905e063423978ad0a3f191c74c52f09ab8f096361f7dcb0ecb4fc069da88b

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