Malicious PDF — malware analysis report

Static analysis result for SHA-256 53562758b8621f57…

MALICIOUS

PDF

34.3 KB Created: 2021-06-23 14:29:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 846a8d769b0f9426c1bc8d2f40e24bef SHA-1: 3b9cd8cc0b4ff253ac9e2d101ae507c54669e629 SHA-256: 53562758b8621f57d5e61894cae638b96d39f9aeab5c6f61a4fe04275ff7daa1
220 Risk Score

Malware Insights

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

The PDF document contains numerous links that redirect to malicious infrastructure, masquerading as game hacks and generators for popular games. The heuristic firings indicate this is a link farm designed to lure users to potentially malicious sites, likely for credential harvesting or further malware delivery. 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/chat-hack-roblox-download-game-hack In PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-cheat-roblox-tycoons_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/hack-scritp-inputter-for-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/rbxdemon_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/hacks-minecraft_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_off00002ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF7 21804 bytes
SHA-256: 58c1083c6ad64257dd03c365e0e430c31972dc4a21687e34846dd3014f48fc04
font_01_sfnt_off00005fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE3 19432 bytes
SHA-256: 41b6dfafeb47c72cf630957fbe7b7b008c0a92c7657f59246cec3b50fd3a9504