Malicious PDF — malware analysis report

Static analysis result for SHA-256 383dc38864ce906d…

MALICIOUS

PDF

35.2 KB Created: 2021-07-01 17:00:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 701ade6c57d8fa5bcf28748ebdb379a2 SHA-1: c8c233a12002afd2e023a809579b011e2595c326 SHA-256: 383dc38864ce906dc278bdae12c16809965f7cae59401bc56164d81d0149219f
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are designed as SEO link farms for game-related cheats and hacks. One critical heuristic identified a direct link to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text and URLs consistent with a lure for free game currency or hacks, and the presence of a 'password-protected archive' lure suggests an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/robux-hack-download-pc-2021-game-hack In PDF document text
    • http://library.umuslim.ac.id/repository/thanos-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-hack-jailbreak-beta-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/cool-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/is-it-really-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/best-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-works-in-an-hour-pastebin_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/hack-para-island-royale-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-genearator-2021-no-suryve_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_off000030fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30FD 22088 bytes
SHA-256: df5ff8cb0ab6ca4cad937552409d3902ff72031f25d83a7e0b0a43bfa31bbb3d
font_01_sfnt_off00006201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6201 19860 bytes
SHA-256: 1f7eaff9db13705e37a3fbf888dc281c9f5c469dbeb0a3ec8c8f9007025c5f05

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