Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8c0321f5449c01…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 11:24:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b1ef03c5494c894f2f7bd7e38bf8e99 SHA-1: 11ee0e0324797012bda77254272ac2311c35abe6 SHA-256: 5f8c0321f5449c013b736b071403e27f9d20ffb68daf9fb6fe924f3e760c2fc2
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/406889139/2021-free-spins-coin-master-link-game-hack PDF link annotation
    • http://librarystkippgribl.com/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/javascript-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/youtube-how-to-make-something-on-roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-hack-fly-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/hack-apps-for-roblox-video_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/games-for-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-rules_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/poke-preston-roblox-hack_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_off00002fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD9 22600 bytes
SHA-256: 7cbe66b4b4ed4b254151000e725e86f650079f072f9e186dc4266169b6daec5a
font_01_sfnt_off00006256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6256 18748 bytes
SHA-256: 06bd034753b49a7d0cfb2aac0b95d0bc387526a0c49ff8a26704903fcf1c9189

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