Malicious PDF — malware analysis report

Static analysis result for SHA-256 5893a040c2995dcb…

MALICIOUS

PDF

53.8 KB Created: 2021-06-11 10:47:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3ab6db277be74209640ef00a622da035 SHA-1: 0f4f756e83c53085377b1bf6c9da23b8b0de074a SHA-256: 5893a040c2995dcbcbf11c8fe247b6bf3f90e00b34a7f34f9b4a88620cc7b9c7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The primary lure appears to be 'Free Robux' and game hacks, indicating a phishing or scam attempt. The document's structure and embedded links suggest it is designed to redirect users to potentially malicious sites that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-no-surbey-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-money-on-jailbreak-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-catalog-items-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-how-to-cheat-on-fantom-forces_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-pet-simulator-cheats-mobile_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-created-by-batu-kol-faki_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-cheat-shinobi-origin_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_off00005588.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5588 27012 bytes
SHA-256: f74574a0669de08bf2d78a970757b804669f6db58c5c713e87a364ab51c39997
font_01_sfnt_off000095da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95DA 8144 bytes
SHA-256: ccc6b3b48b4352670efb2c5f38359575db81c0b859276fe04103ccdb4c5661cc
font_02_sfnt_off0000b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02B 18196 bytes
SHA-256: ae790095113d961dfe1e52ddff9bfc6fbd99e82ac5c0573ecd8f2d025baa55a3

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