Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d31320cd22ad04…

MALICIOUS

PDF

47.7 KB Created: 2021-06-09 04:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 11abb454431233388bab31d4c15d9130 SHA-1: bd851effd4cd9b8e485e4217893373785ac7bff2 SHA-256: c4d31320cd22ad04d03fc3df1d25abf82035a5292cd7ce8c1cd7a391355a894f
200 Risk Score

Malware Insights

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

This PDF document employs social engineering by presenting itself as a lure for game-related content, specifically 'Roblox Free Clothes'. It contains multiple embedded URLs, including a primary link to a known malicious redirector infrastructure. The document also includes a visual call-to-action and a lure to install a browser extension or update, common tactics for credential theft or malware installation. No scripts were extracted, but the presence of malicious links and social engineering lures strongly suggests an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://netcdn.tw/app/431946152/roblox-free-clothes-in-catalog-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-for-kids_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-quiz-diva_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005207.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5207 26352 bytes
SHA-256: 454c539ba168fc30120cf32f4fed77602c3db941f326bcd999bdb307d4a5d953
font_01_sfnt_off00008c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7E 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9669 18732 bytes
SHA-256: 29d2518cdcb9524088e8fad99ab65c69db5058031d5fec94e4d3915c359dee1f

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