Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fcd90d1adba1ee…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 14:46:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9ed7f5f634de98902b3d15a956435aa6 SHA-1: c95db9e073bb9b6fd3b03a1fd041c82c9b5045bd SHA-256: 13fcd90d1adba1ee19c06cf64dcf55bbe2cb761676e1fae642d62129006e6dd3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The document body and embedded URLs reinforce this theme, aiming to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-coin-master-spins-blog-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/area-47-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-admin-on-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/get-free-roblox-visits_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-cheat-engine-2021-may_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-earn-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-severva_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-apple-phone_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-change-your-roblox-username-for-free-no-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/boku-no-roblox-remastered-op-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/tiktok-free-no-sign-in_GM835599320.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-ben-ten-universal-showdown-cheat-codes_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-dino-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/thanos-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/cookies-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-how-to-get-the-sqaure-body-for-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-god-hacks_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_off00002ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFE 23192 bytes
SHA-256: f6ab1e6a015185768c572189600fb4fd76dc1adaf1e5bfaa0cf18be226e94c7c
font_01_sfnt_off00006447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6447 18464 bytes
SHA-256: 4bcaff5a2789d7186c9fa4ee96d365b8eba602a20bbe86fe3da838c25a781984