Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2f16fd5434753c…

MALICIOUS

PDF

36.0 KB Created: 2021-07-03 23:14:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 17f4311798601646bf1b05934e4fd13d SHA-1: 04719b202debc06fdedc6c48bf657ffd849bd32a SHA-256: 4d2f16fd5434753c0bf10b2c0bbbc82db0de6eed2f85e314e96f241b7b2b7fc1
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/431946152/how-to-hack-death-run-roblox-cheat-engine-2021-game-hack PDF link annotation
    • http://stikespantirapih.ac.id/home/repository/rocash-give-yourself-robux-cheat_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-card-reedemm-code_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-from-account-birthday_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-no-download-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/como-tener-ropa-gratis-en-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-download_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hack-deutsch-ohne-handynummer_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-accounts-not-banned_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/only-you-little-mix-and-cheat-codes-roblox-id_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-minecraft-alt-accounts_GM479516143.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_off00003227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3227 22904 bytes
SHA-256: 14aaf97ad14de532361c8a1dd39fa1bee1f10b71b5b88638bcbc319134d09d46
font_01_sfnt_off00006599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6599 19736 bytes
SHA-256: bf6b8ab22c10dd992631f9c82ec3465541d762be714060187bc07c0c76cba494

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