Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5bf6a4743e9258…

MALICIOUS

PDF

38.3 KB Created: 2021-06-28 16:05:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 04ec03b0582a74c8e6ea5114e4a77c59 SHA-1: adc4f60d6493ed208ca9f880f0fc26a540efcfb7 SHA-256: ff5bf6a4743e9258b80e5434a9c3ef0562a070aafd5adf61338a28aa5f277c9a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external websites, masquerading as generators or hacks for popular games. The primary URL, http://netcdn.co/app/431946152/free-stuff-on-roblox-catalog-2021-game-hack, is identified as a malicious redirector. The document also hosts a large link farm pointing to other PDFs, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the extensive use of malicious links and redirectors indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/free-stuff-on-roblox-catalog-2021-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-cliens-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/do-roblox-admins-get-free-builders-club_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robloxjailbreakfreehacks_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/survey-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-avatar-codes_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pokemon-go-free-hack-apk_GM1094591345.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
stream_002_off00003c00.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3C00 23068 bytes
SHA-256: 409780de4bf335fbbda98a857ac97542750214b10a7aa02c3b6f79a63eb7ec60
font_01_sfnt_off00007014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7014 19296 bytes
SHA-256: 93e631cb4d808fd4cce646ad0d718b89bb53b4d6eeb58f1df884b977b3f40b27

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