Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c1f76deb0c53d2…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 02:44:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c636c05552f01290e4023f1ddf9cb10a SHA-1: 6f9afad1d1a4d7a1145fe9065465c9dcddbd5e7f SHA-256: 62c1f76deb0c53d2443f7299ce3280b4082e22d80ce9e4553d2a48dc6652bb3e
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/mcpe-master-hack-unlimited-coins-game-hack PDF link annotation
    • http://digilib.unla.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/fly-hack-roblox-no-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/pubg-uc-png_GM1330123889.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/saving-pikachu-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-generator-no-installing-apps_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spin-today-2021_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_002_off000032be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32BE 22960 bytes
SHA-256: 383411b4979a4a26f9e6fefea82f89084b240369bbdd429f9e237f389133ce7e
font_01_sfnt_off00006639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6639 18876 bytes
SHA-256: 89932f8f13001460a6ffade74f2ab8dc0afa327f081132bd5821be57dc25f5e8

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