Malicious PDF — malware analysis report

Static analysis result for SHA-256 f370313de4a04779…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 16:24:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1cc5271b5a49eae71f9d095d702a9636 SHA-1: 2f6f380d138530f72a33dc14f4915959b28888b3 SHA-256: f370313de4a047798f7ee905fcb183b25f32f24bbe3859add08ffef4c290de4d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is designed as a lure, using the guise of game hacks and generators to redirect users to a large collection of other PDF files. These linked PDFs appear to be part of an SEO link farm, aiming to drive traffic to various exploit or scam sites. The primary redirection URL is http://netcdn.tw/app/431946152/roblox-script-hacks-game-hack, which likely serves as a gateway to further malicious content.

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/431946152/roblox-script-hacks-game-hack PDF link annotation
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/aincrad-online-free-beta-roblox_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/infinite-moneyz-roblox-injector-hack-pizza-place_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/pokemon-go-five-free-raid-passes_GM1094591345.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/a-wolf-or-other-roblox-otter-space-cheats_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/hacked-roblox-account-for-sale_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/roblox-hack-no-survey-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-spin-coin-master-apk_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_off00002f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F59 21656 bytes
SHA-256: bb20ea8044a42f9a2ae06177ffd9c23835f16cfbd9c189b1b0b41b44ffeb9738
font_01_sfnt_off00005ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE7 19056 bytes
SHA-256: d579aac1d1158a15ad46381a3b3d03b5c9b37299ce5790291e99ad749e5be703

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