Malicious PDF — malware analysis report

Static analysis result for SHA-256 5262ec6c20552199…

MALICIOUS

PDF

34.4 KB Created: 2021-06-21 09:05:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 63fea86a21646e257065ffe4d3244ba1 SHA-1: 043f1c564ac4408b19c453ce950d98a1055c29bf SHA-256: 5262ec6c20552199e793aa136a74bc0a6185c2276258da393e660757a9d1430f
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/rblx-city-free-robux-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/real-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/make-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-2021-no-verification-no-scam_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-robux-cheaten_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-minecraft-account-and-password-generator_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_off0000304d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304D 21976 bytes
SHA-256: 759570a70e6c6f96b5af03e9343d8c5cbf8156e25abab7db4139634e354d6b11
font_01_sfnt_off00006105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6105 19196 bytes
SHA-256: f2f3397c6c781d56e9789bf5c46018266820e8d927479f7a86dfea2d7904bf30

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