Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5df6a5eb91320f7…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 00:24:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e7e7c1def38a9e5029d414f75a9953f3 SHA-1: 759082fbd17caefa57d538bd3faab41e1b4a761f SHA-256: b5df6a5eb91320f74896d0558b0349090dd59964d5f0ef50326f6dfc1fa3ed23
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-spin-link-today-game-hack PDF link annotation
    • http://digilib.unla.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-robux-hack-yourself_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/are-roblox-hack-clients-real_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-roblox-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/i-was-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-printable-black-and-white-roblox-valentines-day-cards_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-roblox-accounts-2021-with-robux_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_off000030f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F8 22804 bytes
SHA-256: 91af410f3fe016d1c41a2bf7492e4809f24e955e7dc468b2576e75c703f07ab7
font_01_sfnt_off00006408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6408 18536 bytes
SHA-256: 232cb4b515db04c7b0e85e36ce0db153ce2fb992ec8f88a884e5f1f80d4c2854

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