Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92479f8565ff459…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 12:16:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 225b6b3369ed752f866b3728ddebd0d8 SHA-1: 0b6b85aa2cb57dc29e3d62693c98f77e6f922271 SHA-256: b92479f8565ff459a92ead1646fdb1279779ce096d2fd0972f87314a22cad08a
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 0.9981

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/479516143/minecraft-servers-that-allow-hacks-game-hack PDF link annotation
    • https://pt-mataram.go.id/perpustakaan/repository/boku-no-roblox-remastered-buy-hack_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/cheat-roblox-tire-dans-les-mur_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-robux-free-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-ios-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-roblox-card-pins-2021_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-hack-hay-day_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-free-gamepass-on-roblox-phone_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-free-robux-on-computer-no-inspect_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/hackcom-for-roblox_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-apocalypse-rising-spawn-hack-2021_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-exploit-2021-free_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-play-bloxburg-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-live-stream-now_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_off000034a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A4 22296 bytes
SHA-256: a58cf93395b4dc58b226bddaf48a83f72b1ac60539c28c55a6a1ff597bed7368
font_01_sfnt_off00006654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 18688 bytes
SHA-256: 52b008c1dee13834d2ec83d98dfe79a40f83e68d5b96d4fb2c84ac72eafae7a4

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