Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a090f6151b056d…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 11:27:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5283e537d22d9e39d11955b96d07c260 SHA-1: a1dc43ad60dda7269d2c710b77a35ee55678ec76 SHA-256: 46a090f6151b056d687c85fefc548f2dcd13f975eb07fa5d9d947a8c0b5779e9
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 0.9865

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.online/app/479516143/free-minecraft-shaders-game-hack PDF link annotation
    • http://lib.untad.ac.id/repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/moon-active_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-followers-on-tiktok-without-human-verification_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/pokemon-go-free-xp_GM1094591345.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005264.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5264 26280 bytes
SHA-256: cf97094d2b95300d724af79fd98284a019b58fbe4bb01aa909f25fbaff0ab3cc
font_01_sfnt_off00008d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D60 17908 bytes
SHA-256: 35d3f4bf4307bd8a3f315663bc97638986f3fc82832bfbc69b2a41c23e708d7a

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