Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cd58f5d7a31894…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 07:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 60ab6ec47854b84c07b6767cf5c720ab SHA-1: 724bc8a93c3d561bd1d29a44cee1dc68f1c6d208 SHA-256: 90cd58f5d7a31894c34007023302a46aa8bd96042e485cdcf2bba674ebd900b1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, including a known malicious redirector at http://netcdn.tw/app/479516143/minecraft-free-reddit-game-hack. It also hosts a large number of SEO-optimized PDF links, suggesting a link farm designed to attract users searching for game-related cheats or hacks. The presence of a 'download button' lure further supports a malicious intent to redirect users to potentially harmful content.

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/479516143/minecraft-free-reddit-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-someone-hacked-my-account-and-traded_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/assasin-roblox-auto-farm-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-do-i-hack-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-how-to-hack-peoples-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-black-hair-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-chain-download-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-download-free-for-pc-full-game_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/ab-ble-to-do-n-roblox-pizza-place-hacks_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-the-chill-turtle-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/android-1-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-apk_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
font_00_sfnt_off00002fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC7 22524 bytes
SHA-256: 824e46a0db468d4a7b9780cdc759c4dad312e7ec5e3991ba1c353a43c66a14eb
font_01_sfnt_off000061a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A1 18028 bytes
SHA-256: 643495630a0e2882763c76801d421163758b25dda5a584bed505c907634fa296

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