Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4986faa15d6b5f6…

MALICIOUS

PDF

48.9 KB Created: 2021-06-11 05:09:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 36c2af9a0f9ed14f6617f0e17579bd61 SHA-1: 1231b7234ea30e7ba4d1317d4d2f4c52b1c13595 SHA-256: c4986faa15d6b5f6f5fa2c97984a9bebb97a733400cab65ed2fbe54b05ddc450
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 0.9796

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.tw/app/431946152/robux-game-link-hack-game-hack PDF link annotation
    • http://digilib.stimata.ac.id/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/greenwood-roblox-como-consegir-free-vip_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/pubg-uc-carding-quora_GM1330123889.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn 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
font_00_sfnt_off000052d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52D0 27876 bytes
SHA-256: af3b031aa9e49adb489f464969656c00ad6ceaa886949f1e4cb4be3d715fc90b
font_01_sfnt_off000091c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91C7 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B78 18628 bytes
SHA-256: 0c8f1ddc0b8e4e7fc49b46340dbeab42d23f4820398955dc4ed22364a688d7e6

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