Malicious PDF — malware analysis report

Static analysis result for SHA-256 72119c36c78389d8…

MALICIOUS

PDF

35.2 KB Created: 2021-06-25 05:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4a302b325719ffce7fd634d75a7bfcf8 SHA-1: 8ad564443443dd175c2c9a73c834d4a4ef15992f SHA-256: 72119c36c78389d8c75c0e14c76a126a592a1263ee2352d6f1d4d85db6af9625
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.co/app/431946152/cheat-roblox-en-francais-game-hack PDF link annotation
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-toys-code-free-dog_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/get-free-robux-now-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-fly-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-case-clicker-hack-download_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-wear-no-clothing-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-human-verification-at-all_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-earn-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/hack-for-counter-blox-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3377 22300 bytes
SHA-256: 4371b061c9a3152be54b8b8f6e18c636c5a1b51ebfa7f0b6e45196867ab8a502
font_01_sfnt_off000064c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C5 19040 bytes
SHA-256: d49a497f625f7a9ecbf8a200b25b6fa23cedf30bc3946adb631f3b7d0a72167f

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