Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e4501be7264e8a…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 16:20:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f28c29c4a2f1f9e2d7228a9053b2ad73 SHA-1: d95682579df07d18af6963803346d7b432254a1a SHA-256: b7e4501be7264e8a6442633c3676de3b702c5487ca10279c38f2448fe9d2dfa2
182 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. It uses a password-protected-archive lure. 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 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-robux-no-verification-no-download-game-hack PDF link annotation
    • http://library.darmaagung.ac.id//repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-gift-cards-for-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-roblox-account-password-and-username_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-ot-get-free-robux-nathorix_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/ban-hack-roblox-moi_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-get-roblox-redeem-card-for-free_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-get-shirts-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-get-a-unicorn-in-adopt-me-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/solos-v-12-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/cheat-codes-for-pokemon-galaxy-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/roblox-meep-city-game-free-download_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/ww-roblox-come_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/skype-hack-roblox-2021-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-get-free-roblox-clothing-no-hacks_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
font_00_sfnt_off00002fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEE 22320 bytes
SHA-256: c8392c0876e95ec087d4de0d06b5c56cbbb176496abe0c2e87d5920d2b303653
font_01_sfnt_off0000616b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616B 19652 bytes
SHA-256: 8dba42de70404ddf4ce7a70a40047468e67895e17bebeb66015d1708da090460

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