Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b36b54bb07d7b33…

MALICIOUS

PDF

43.3 KB Created: 2021-06-04 03:16:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d868366757b81b2dec67f3358f35f394 SHA-1: 4c15a98e97186e301a3ea91fb7cc91321a7ce228 SHA-256: 5b36b54bb07d7b33e8d44114a8dba1327c75f025c2f62d8874bbeed37cd1c663
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 0.9865

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-free-card-link-today-game-hack PDF link annotation
    • http://oca.undil.tl/repository/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-account-hacked_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
stream_004_off00004ecf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ECF 24588 bytes
SHA-256: 4de5ef3e3c8aa333346235f273aaaec47d849becc480ab870b6a0d8254ea0212
font_01_sfnt_off00008686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8686 18232 bytes
SHA-256: bb090f263e704b9e364c49221e502887c5f7468e186fb315b70110f66f8504d6

Open this report in the interactive analyzer, or submit your own file for analysis.