Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef02309738c7986…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 16:26:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 387d0215e25c1a3e494cdb8175b10fb2 SHA-1: 42f9144efa1db179bc04af41f77ff0b4c7917851 SHA-256: aef02309738c798675029e0ef3a8362b6813c37cbe8f9c8d421c0579fd11fcad
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users to external sites, including a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-2021-today-game-hack. The document body and heuristics indicate a scam related to free game currency or hacks, likely intended to lead users to further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/coin-master-daily-free-spins-link-2021-today-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-really-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/grayphiny-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-a-roblox-account-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/les-commandes-dadmin-roblox-les-plus-cheat_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-items-in-roblox-using-toy-codes_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-do-you-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/music-hack-2021-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-roblox-coders_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_off00002e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E86 22360 bytes
SHA-256: acac85a3837b6638505a74271a81bee5f5c496f89c6fc39f3149d9222afb08a9
font_01_sfnt_off0000604b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604B 19344 bytes
SHA-256: 2b65a240a25012a699619f5b44b4403fb2d70dbe90fc6d16a4cece9e458288ef

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