Malicious PDF — malware analysis report

Static analysis result for SHA-256 24533755be159f02…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 15:02:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d4e86edc6d07314eef64db95f0d7c015 SHA-1: d4def3720ab2af0c59436c4fb9e53b974d82d3a3 SHA-256: 24533755be159f02cebde0d392fed8e4f34f292b3cb00d8037826c028262dc1b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-hack-ios-apk-game-hack PDF link annotation
    • http://lib.untad.ac.id/repository/roblox-top-battle-games-read-online-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-tool-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/descargar-hack-de-robux-para-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-kick-gui-2021-work-in-other-game_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-pick-a-side-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-mad-city-money-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/i-succ-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-alle-pets-duplizieren-ninja-legends-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-call-roblox-on-pc-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/adidas-roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-gamepasses-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-download-ios_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/earn-free-robux-no-survey_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
stream_002_off000030c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C5 23056 bytes
SHA-256: 509cd0a3d6d4485a293fb67bcbe652a4024170ce4760b06feb19577d58935a25
font_01_sfnt_off000064bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 18180 bytes
SHA-256: 4c5127a69f018205538da135c479e78cbc581b43c71a88b63707f7d03620f798

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