Malicious PDF — malware analysis report

Static analysis result for SHA-256 385dbaf485e395b2…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 03:30:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 93c93c1f3c880492b68566b611f93fd6 SHA-1: e2566ecfaff6d3f972352bd7906cad7e2eb81747 SHA-256: 385dbaf485e395b250f316a6076c7d0ebd036cac2b61eca43a5281bf5e8edd0e
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.tw/app/431946152/free-robux-working-game-hack PDF link annotation
    • http://opac.pps.uin-alauddin.ac.id/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/cerberus-free-download-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-unlimited-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
font_00_sfnt_off000033df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33DF 21824 bytes
SHA-256: a00e76edce26676ec1588b868520b4e3a23f44f5d699d0e060149dd47e58f58e
font_01_sfnt_off000063df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DF 19204 bytes
SHA-256: ce738487085ad599441484df9d90a1a143049edc5affa9a85a5d558c4f13480e

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