Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c47c6804871ec7…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 13:07:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 249cb8c229da50fa67731d8b4cf91daa SHA-1: abef66a303c1bd4cec20fabe86467877a40b856e SHA-256: 39c47c6804871ec7dccc03f4fdb65e9d43fd7028581529ee042de9156671c941
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-spins-daily-game-hack PDF link annotation
    • http://lib.fekon.untad.ac.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/minecraft-hacked-client-18_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_off00005128.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5128 25048 bytes
SHA-256: c938570cf324714371794b40606ca81b1615fd3ea3c0f64a18b85e66e043fe66
font_01_sfnt_off00008a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A78 18308 bytes
SHA-256: 220bb6194b1ab8a2bb399ca4a862914ac8d15b354bb0df2c737bc67699221dc9

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