Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e5059373059be0…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 21:53:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 61a0a15c037a4bb7cd30e646d486f403 SHA-1: b88c80b75c952fc34d085369c440c9701a0b4167 SHA-256: 55e5059373059be04bf08870e1ea6af8a3f98822afa3cfa0eabe2fbf5c05afa3
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/479516143/how-to-get-minecraft-windows-10-for-free-game-hack PDF link annotation
    • http://pustaka.fk.unand.ac.id/repository/roblox-tix-robux-hack-download_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/comment-hack-roblox-prison-life-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/cheats-codes-roblox-treasure-hunt-simulator_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-roblox-promo-codes-2021-april_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/hacks-bandit-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-get-free-robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/isle-how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-speed-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-cafe-groups-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/hack-pour-roblox-sur-rocitizens-pour-avoir-plein-d-argent_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-hack-models-into-roblox-t-shirts_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-unused-roblox-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-hack-one-piece-millennium_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-promo-code-hack_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
font_00_sfnt_off00003089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3089 22184 bytes
SHA-256: b49540826c700718495305dce668552d27676b6b0c72d7b06b2fd9606e074232
font_01_sfnt_off000061a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A1 18812 bytes
SHA-256: 78af6c1a79895a4d6094e0f9df7a7bf166215c31d8c8ac3ce0b9542e24fb5cba

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