Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34536d7d23c1e7f…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 10:18:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d328f303645f3e986c3b4021adcfd43a SHA-1: ef5e47092afa01c3d9244b9301da92fa87579b50 SHA-256: a34536d7d23c1e7f3d56161843b983062c46fad53e2e66ecf187a4df9558edaf
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/roblox-games-that-give-you-free-robux-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/free-robux-may-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-flow-id-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-white-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-inject-code-into-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-hacker-outfit_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-make-an-audio-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/broken-bones-roblox-hack-v3rmillion_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-no-verification-or-download_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-roblox-mod-menu-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-to-make-you-move-in-roblox-survivour_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/money-hack-roblox-pizza-place_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-create-vip-server-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-may-11-2021_GM406889139.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_off00002d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D76 22580 bytes
SHA-256: acac6e68090a1a4f1f06e70344c3db0dbf4e5e9d8053e2d46a0954aa010454fb
font_01_sfnt_off00005fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 19716 bytes
SHA-256: a049f91da2a5f673ee8bdddb66e04ab16341ee881dfe876bfe6c1856da68d744

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