Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb5c6416b147e97…

MALICIOUS

PDF

34.8 KB Created: 2021-06-25 16:00:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fc80d6a60d62557aefa1c46a474011a0 SHA-1: 138dfed0fdccf72d20c3390ec5a3393ec55c23e8 SHA-256: ffb5c6416b147e9739f42ae406689d07bd88278098704b865eaf5f5141c81512
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/roblox-dungeon-quest-hack-script-pastebin-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/como-conseguir-robux-en-roblox-sin-hacks_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-make-everything-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/intriga-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-hack-file_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-uploadable-images-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-food-tycoon-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-accounts-with-robux_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_off00002f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F28 22388 bytes
SHA-256: fafabb03ded75fe014aecddb873c32ee0e44d62befa4b5d664352a9a23fcfd85
font_01_sfnt_off00006126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 19676 bytes
SHA-256: ffd035cff6a1a18f64ef387f294049cf5b5e7755288688aa36a14c30d0e6c21e

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