Malicious PDF — malware analysis report

Static analysis result for SHA-256 572a3977438bc4a5…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 19:33:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 358b0c34d632ac5fc00fa6386182e45a SHA-1: 221144c3bc343e3b1e7569233062c5dd04e528ac SHA-256: 572a3977438bc4a52cfcd9f438e6a6b239afc2855f90e259b1051d6d4e0a65ab
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/free-robux-no-generator-game-hack PDF link annotation
    • http://sttlets.education/senayan//repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-lvl-10-roblox-exploit_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-robux-giver-free-download_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/best-free-building-games-in-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/robux-hack-kids_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/robux-hacks-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/is-casdg9-a-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/btools-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-no-surveys-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/youtube-roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-free-play-without-download_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/como-tener-hacks-en-jailbreak-roblox_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_off00003090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3090 22320 bytes
SHA-256: 8558140de61c979447cdc8e5a3e347b23c4b750fd9f848956b1a0060b1bb3595
font_01_sfnt_off000061a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 18820 bytes
SHA-256: 261ea0d489a423ac242e977cf9c2ebb558fc055835ac2ff71b731d45313ea59b

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