Malicious PDF — malware analysis report

Static analysis result for SHA-256 345384e71f633cbc…

MALICIOUS

PDF

44.9 KB Created: 2021-05-16 17:24:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 124cf54769a10c7bd261ae06b53ecc7e SHA-1: 25f159fb7cb901e2f59754ad001af1920fd1f1a6 SHA-256: 345384e71f633cbc2978bad1a29bec426ed3174a38f83d1bfc493e9b59aa9e8c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links disguised as game hacks and generators, aiming to trick users into clicking them. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO poisoning tactic. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt, likely serving as a lure for a more significant attack.

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-downloading-apps-game-hack PDF link annotation
    • http://eurosystemssrl.it/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/roblox-free-robux_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
stream_003_off00004b4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B4E 26080 bytes
SHA-256: c05764cf10266e6d122aae72bc6fd448cbacfce7a7442ca319c618cd9506ea67
font_01_sfnt_off00008859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8859 19876 bytes
SHA-256: 8da7f6a753952615a486eb6a0fdfe7794e2ad045808eb185ac8c0a25e8999c49

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