Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aabbb013c5b1093…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 11:47:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 30af9d0cc24550cad607174f9ed46b77 SHA-1: e9c4805dfdbbb5ea64b03ae131a16108439d72d7 SHA-256: 1aabbb013c5b109382fc0ea6f672bcdfce2c8ad165c220f5154fd9b3596afe6d
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-tips-game-hack PDF link annotation
    • http://library.umuslim.ac.id//repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-build-a-boat-for-trasure-fly-hack_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-hack-stuff-in-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/download-hack-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coun-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-free-robux-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-account-pin-hack_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-vs-in-bee-swarm-simulator-hack_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-tutorial-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/links-to-get-free-spins-on-coin-master_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
font_00_sfnt_off00002fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCB 22520 bytes
SHA-256: b3977af582a099e020f71e5c5ed6a0d53eb52940f23bc1818cf55f5a1fb8a682
font_01_sfnt_off00006203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6203 18180 bytes
SHA-256: b0883ae95b36653d00b2f12e9570232dc7bb6c108c05f5d6d5c12e7eecef38d8

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