Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2eb8385107e36dd…

MALICIOUS

PDF

42.2 KB Created: 2021-05-10 14:10:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f9a11317afd125292cef8f6e19c34218 SHA-1: a57dc3c2d91e2b638b8f84c68a21a7300cc0b71f SHA-256: f2eb8385107e36ddda1f4ea171243c3fcf8f811c121b16bc2e2eff57403fc024
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 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-coins-generator-game-hack PDF link annotation
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-tool-without-human-verification_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
stream_003_off00004b0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0B 26168 bytes
SHA-256: 481569f603a116afd23b924325dce7f5eac032194c5c08ea10cd77ed267a670e
font_01_sfnt_off0000846a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846A 17712 bytes
SHA-256: f6b7bbb27796bfdd91832c5c9631b2ef3c604ec4967bc220e21b541acce31e79

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