Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cc6566cf0d8228…

MALICIOUS

PDF

33.5 KB Created: 2021-06-27 22:52:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fe17d6f09573e2cc0dc0a04d25aa4da9 SHA-1: 50bcc9c041d678ae86ccfa60e8c748fa14f0e140 SHA-256: 36cc6566cf0d82281d8401f46625005248343c4bf72b9b70463b8d9760269c29
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.co/app/431946152/free-robux-november-game-hack PDF link annotation
    • http://elib-s2.ubl.ac.id/repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-project-pokemon-money-hack_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/get-roblox-hacks-mac_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-unicorn-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/buy-for-free-roblox-builders-club-classic_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-in-roblox-jailbreak-on-ipad_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-roblox-dlls-hack_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/easy-way-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-into-other-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-promo-codes-august-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-be-a-hacker-on-roblox-ipad_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.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_off00002ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCD 22008 bytes
SHA-256: 9678300c0ed6d48ac031f0100dc8bb8a308d82ab9cb2990955a03fa17cf51c74
font_01_sfnt_off00005dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD1 19092 bytes
SHA-256: 20daf439ea815fe9af0865307b7132254b36ce7c7bbc1b6324e99c4af7dd3c27

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