Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb51b451ecdc1a48…

MALICIOUS

PDF

47.6 KB Created: 2021-06-10 17:26:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 039b2ed05cde04e5b6f65feecff4b1bc SHA-1: 4f98a2e41aac2a4f0ecd4c2c6261e62c54e21c9d SHA-256: fb51b451ecdc1a48e9b9ebe84637d8d5a950f134199a4c5eee290810f1880ec4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically designed to lure users with game-related content. The embedded URLs and the document body text, though partially corrupted, point towards a scam aiming to drive traffic to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.
  • 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 https://netcdn.tw/app/431946152/lvl-7-roblox-hacks-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/kids-games-free-roblox-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-a-free-private-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-steves-one-piece-hack-tp-chest_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-local-fly-script-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/template-roblox-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-name-tag-hacks_GM479516143.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_off000054bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54BD 24328 bytes
SHA-256: cfcf0471121cdef38ecbfe29a435e8ccbbf15288851c77b17006f71ccaf48a70
font_01_sfnt_off00008c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C49 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off000096ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96EF 18352 bytes
SHA-256: d6fbe74444d79d42775d23f58027ae6db3c984adf3c77451784e0e8a605bc54f

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