Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefa963c743066cf…

MALICIOUS

PDF

37.0 KB Created: 2021-07-06 13:02:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f9d1195649eaebe7bd0a2e2521c9b111 SHA-1: 8b7f45a084e180db4e977694800f0895f53fef97 SHA-256: fefa963c743066cf44c47a9073aa95ceb2f9d43325c560db4610870fee3f6aad
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-gold-cards-hack-2021-game-hack PDF link annotation
    • http://lib.teknik.unimal.ac.id/repository/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/get-roblox-clothes-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/mm2-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-apocalypse-rising-2-cheats_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-tshirt-roblox-nike_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-clothes-on-roblox-2021_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_off000037fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37FB 23352 bytes
SHA-256: 3371287e47fb143c8817da9587b1bc3a1b1b1b568521b3295da5dabb20b9934d
font_01_sfnt_off00006ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCB 18656 bytes
SHA-256: 97782c777a3eb5e96f5d908785d6f5274c8dd961e5cba14107e5c2104e556f1d

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