Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41acb55b5764519…

MALICIOUS

PDF

34.1 KB Created: 2021-06-28 03:47:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b0f46cc4c751b952906d406de8dd9a76 SHA-1: d66ad84dcfc33cf41067f299cbb337167ae63dcc SHA-256: d41acb55b576451904c4520adeed1418d2c83d2a94a0cd9376aa496f8c91e7b0
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.co/app/431946152/redeem-cards-for-free-robux-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/robux-hack-by-villarnor-gelerb-pastebin_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-bloxburg-hacks-instruction-and-screenshots_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-teapot-turret-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/ariana-grande-break-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/pubg-uc-murah_GM1330123889.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-shirts-free-girl_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-a-free-radio-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E76 22332 bytes
SHA-256: cb8064e30a27a6cf821a61321a404c0ac2099dc16a298224d665ddb741fde847
font_01_sfnt_off00005ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFC 19152 bytes
SHA-256: e1725bab30a5e7a4c2bf5745b0b9e2a3c92b942f50c945d767bc384dad3f4760

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