Malicious PDF — malware analysis report

Static analysis result for SHA-256 968766314ee546b1…

MALICIOUS

PDF

35.6 KB Created: 2021-07-01 22:07:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 107c9db757dab69ee3386ba00b5eeb2a SHA-1: 0c964680864a679bf66a250cd34a434f892f9c42 SHA-256: 968766314ee546b16c4138f81bd85a0e64d181431840b2112f666f56140d62be
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, including a primary link to 'netcdn.co' disguised as a game hack. The document body and heuristics indicate a lure for free game items or hacks, likely to lead users to a malicious site. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

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/check-cashed-hack-not-roblox-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-do-free-robux-sites-scam-you_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-follow-a-player-everywhere-he-goes-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/cheats-for-city-architect-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-hack-5-minutes_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-hack-no-human-verification-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-database-hack_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-for-wieght-lifting-simulator-3-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/copy-and-paste-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/como-hackear-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-hack-roblox-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-use-wurst_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_off000031c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C5 23212 bytes
SHA-256: 1541a678382232250a7d39aaee0b55feac62b7abb5baf13d61e4a1399e3aa9f7
font_01_sfnt_off000065f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 19100 bytes
SHA-256: 4169861e7fa2a8ca8c5d599ae6e28886301c5c12325d6fa867944819a289b1c0

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