Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb83473f4220601…

MALICIOUS

PDF

47.1 KB Created: 2021-06-04 03:26:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bdc41baa68777aea5a626edc624d6e31 SHA-1: d012e8cea2e222aeab3c7f330cbe4a361de9f6c0 SHA-256: acb83473f4220601494f647446882f92702803984b2de550f7339c9145ecb341
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 0.9769

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.online/app/406889139/coin-master-hack-without-human-verification-india-game-hack PDF link annotation
    • http://oca.undil.tl/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-become-famous-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005198.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5198 24632 bytes
SHA-256: 6d2d19dab5fa5352d0f6707f0482936ce3e22d11b08706310d50310405fc9d5a
font_01_sfnt_off000089ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EA 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000093d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D5 18788 bytes
SHA-256: f03f84e40d510781fd9acf302c96448e3582cb87a5c2d27401c18c9e1d195815

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