Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1772064068edfbb…

MALICIOUS

PDF

33.0 KB Created: 2021-07-06 14:58:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 85514d2f47d3ed6eaab8af03481090fb SHA-1: f0b0a8068f88c4664b3661169f642cff37b4924a SHA-256: c1772064068edfbb37c706778d6d66c0a20d2d764022b62bd5349e273390f9cd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, including a primary redirector at http://netcdn.tw/app/431946152/robux-free-c-game-hack, which is presented as a 'free generator / game hack'. The document also links to a large farm of SEO-optimized PDF files hosted on elib-s2.ubl.ac.id, all related to game hacks and free currency. This indicates a lure-based attack designed to drive traffic to malicious or scam websites.

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/robux-free-c-game-hack PDF link annotation
    • http://elib-s2.ubl.ac.id/repository/como-hackear-juego-en-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/is-there-a-way-to-get-free-bc-on-roblox_GM431946152.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/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/el-mejor-hack-para-juegos-de-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-roblox-2021-trackid-sp006_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-rs-in-roblox-free-2021-without-hacks_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-roblox-death-zone-glitch_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-no-robot-check_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-free-rc7_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/help-i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-roblox-injector-september-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/youtube-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-be-naked-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-codes-for-roblox-trade-hangout_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/farming-simulator-free-codes-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
font_00_sfnt_off00002c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3F 21940 bytes
SHA-256: a341052b384206d1a81ec7019b8fe2e9094969655e9a5103c3fb847c52ebebe4
font_01_sfnt_off00005cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD6 18716 bytes
SHA-256: 776cb4e5338264d595c967a8fec9379201c9a4b17293b3c44edd5cf6cd499e31