Malicious PDF — malware analysis report

Static analysis result for SHA-256 40af503c736f452b…

MALICIOUS

PDF

33.0 KB Created: 2021-06-29 21:16:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c2b136f0da26098a3d1d249612a5f86e SHA-1: 9c38022f0021bdcd76502d7532fcef6ffbb888d2 SHA-256: 40af503c736f452b797be5fcbd75becb5eac43b71d427ee05333fed6f518cf37
180 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free currency to entice users to click on embedded links. The links direct to a known malicious redirector and an IP address hosting further PDF files, suggesting a multi-stage download or phishing campaign. The ML classifier strongly indicates malicious intent, and the presence of multiple lures points to a common social engineering tactic.

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/hacker-roblox-avatar-game-hack In PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-roblox-accounts-with-builders-club_GM431946152.pdfPDF link annotation
    • http://111.68.26.74/widyapustaka/repository/roblox-cheats-and-tips_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/roblox-hack-game-tool_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/hack-apk-roblox_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/roblox-hoopverse-hack_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/claim-free-robux-roblox_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-to-hack-someones-roblox-account-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/ro-ghoul-roblox-hack_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/play-roblox-and-download-for-free_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/roblox-cheat-engine-hacks-admin-script_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-codes-for-the-floor-is-lava-roblox_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/roblox-robux-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/new-roblox-logo-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/170-robux-free_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-ez-hacks-for-roblox-robucks_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_off00002b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B23 22148 bytes
SHA-256: 31b1dc29536133b010da97a613779a3444c47d8a864e86b2dec628aa5f65d8b0
font_01_sfnt_off00005c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C46 18876 bytes
SHA-256: c471187ea9d0bc25a64f5477079b20ee8551e1ec2c9160e261e1af7ecb6be017

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