Malicious PDF — malware analysis report

Static analysis result for SHA-256 248cab030d2769d9…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 21:29:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5cd41ad36aa9421dc93746432174bd00 SHA-1: 38ee7a056a9452b08067ae4b18551a3519271cdd SHA-256: 248cab030d2769d9232ce1c16e4f19bf14983d312e4f60f7aa36a1ea27106f77
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on promises of free game currency or hacks. One prominent URL, http://netcdn.tw/app/406889139/get-2021-free-spins-on-coin-master-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a pattern of SEO link farming, likely to distribute malware or facilitate phishing by directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/get-2021-free-spins-on-coin-master-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/groups-that-give-free-robux-everyday_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-promo-codes-2021-august_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-stop-roblox-from-closing-when-hacking_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-robux-on-a-ipad_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/bird-simulator-roblox-hack-eagle_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cruise-ship-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/impact-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-do-u-undo-someone-hacking-ur-roblox-acc_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/skin-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-dayz-cheats_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-with-password-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/gift-card-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/give-free-robux_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_off0000300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300C 22048 bytes
SHA-256: 26e8c794ed6cad687d17cdfc3cbe220ea1e795ca56d4767488d5ff578ac39722
font_01_sfnt_off000060c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C9 18576 bytes
SHA-256: 4e53ac7832aa535c4e7ecdb539be5c5de29bf4c01f620500064f2fc2c4f2608d

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