Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c367107cd99593…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 02:03:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e8500eb550a057ab34871c5bf5a76c76 SHA-1: 9594990631f7e2d69b63fe2ff3c11b1068c6b41a SHA-256: 85c367107cd99593af8decdb70fcf9dc8041a239eb46ef80bfab0cd1ce546ead
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/406889139/coin-master-free-gifts-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-super-jump-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-cosmetic-items-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-come_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-money-on-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-hack-no-human-verification-or-survey-2021_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_off000030b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B6 22736 bytes
SHA-256: b8f82ac981569e957ee0c1800011cae70aa411df471edfdac2f8ae75ec6d227f
font_01_sfnt_off00006376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 17996 bytes
SHA-256: 0554876b2ab95b57b2a8903cbabfbfa90e4f9f04422ab63317bc25d957b52972

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