Malicious PDF — malware analysis report

Static analysis result for SHA-256 921c67eee4d5678a…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 10:24:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3bbc81f59591c5accad015b6af96ef41 SHA-1: 30b4a8399781ac1150d378c663bf7dc037c1421a SHA-256: 921c67eee4d5678a4701042878bed24430a524976fbca3b9b65862520b611065
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 0.9864

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/roblox-orby-for-free-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-pant-templates_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-real-no-survey_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-money-cheats-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://www.roblox.coIn 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
stream_004_off00005194.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5194 26564 bytes
SHA-256: d0d1cfb3a26204a2ffe57e4a4062ad07532039660cc8cc4334e31347c7f4f41a
font_01_sfnt_off00008f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F78 18128 bytes
SHA-256: 0fc8498b2ec41afa28654e699937cdcf5a88b8b282b3e4d62bbc4f0a74fda17e

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