Malicious PDF — malware analysis report

Static analysis result for SHA-256 2885698fc08aff0b…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 05:35:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d3c6404eb9d4c09a7ea9b5b43df8f42c SHA-1: c64a043d45655506078e272b732fa9f8f7b5b63d SHA-256: 2885698fc08aff0b26b905101fc77b5e7f4b81b5cf8242ad4b61b522ea31011e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The primary link, https://netcdn.tw/app/431946152/hack-roblox-dungeon-quest-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a lure designed to lead users to potentially harmful content, likely as a first step in a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.
  • 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/hack-roblox-dungeon-quest-game-hack In PDF document text
    • http://www.buapit.ac.th/UserFiles/File/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/pokemon-go-free-7km-eggs-july-2021_GM1094591345.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-giftcard-wix_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/roblox-catalog-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-spins-link-2021-download_GM406889139.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_004_off00004fcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FCB 26296 bytes
SHA-256: 5ec1b273e2077c69325177466966e65d1fd3044448f1a5656af8a3a007245f90
font_01_sfnt_off00008d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D27 19040 bytes
SHA-256: ecb0169e1efac673005864b3e1cca93b5f011ed0f3197c166a65c0b818f20e2c

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