Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d54b6e347907e6…

MALICIOUS

PDF

47.5 KB Created: 2021-06-07 08:31:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 57bfb38b829aa520e7caf01315a28c8a SHA-1: 191f3f3df31c28c6942f74884e82baef08a047bf SHA-256: 52d54b6e347907e6d5d4c067c2011264142a2d7c4dd22ae1d95400647059cfd3
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9769

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-color-name-hack-game-hack PDF link annotation
    • http://torkelson.se/images/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • http://torkelson.se/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/roblox-free-robux-codes-without-bc_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D8 26012 bytes
SHA-256: 5148cbd094acf5e3a5ea37e1693c56116ce71628d6b30a10b4c0b959123513e6
font_01_sfnt_off00008c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9B 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off0000965d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x965D 18440 bytes
SHA-256: 6ea259ef64acfd14f5a5a677fe64d62384779880d34ab0d7be7ad1c241d1159d

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