Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a52915a95321cbd…

MALICIOUS

PDF

33.1 KB Created: 2021-07-03 19:55:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5e8aa279b113a4e0757b6e676233753d SHA-1: 7abe4b10b51ba7d988c9a9da0cb9054a1d669fad SHA-256: 5a52915a95321cbde60aad60945cb78807d3fae0975b10b2ad6f1fc51bce9d24
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 0.9824

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/431946152/you-promised-my-son-free-robux-game-hack PDF link annotation
    • http://astdubai.co/userfiles/files/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-robux-no-website-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/a-wolf-or-other-roblox-hack_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/tiktok-free-gallery_GM835599320.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/all-free-car-locations-in-ultimate-driving-westover-islands-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-robux-free-download_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-stucid-fly-hack_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/minecraft-app-store-free_GM479516143.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_off00002a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A1C 21848 bytes
SHA-256: e17ab4048cda10776f1d89e2888b467653727da97c5f6829222574cd30163d27
font_01_sfnt_off00005a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A34 19960 bytes
SHA-256: f29a7a7b71d38b505cc7d4cb2f72b745270787244330deb29ff722716c8b7989

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