Malicious PDF — malware analysis report

Static analysis result for SHA-256 1725651f18e38d40…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 19:08:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6afdd7ca485dc015675a2c5cfdadedf5 SHA-1: 2040aae32ea10819a0f3357c32c7cb6ad9938efa SHA-256: 1725651f18e38d40034f8d91e9f35be9b3549c180638d3d2b4e6922f3f5d3885
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files related to game hacks and free currency. The primary lure appears to be 'free Robux' and game cheats, directing users to a link farm hosted on netcdn.tw and khavarrooy.com. This suggests a malicious attempt to drive traffic or potentially deliver further malicious content through these linked resources.

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/free-robux-com-roblox-game-hack PDF link annotation
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-a-bizarre-day-hack_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/9-legit-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-hack-tool-robux-and-tix-download_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-to-fly-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/easy-robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/hacks-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-robux-easy_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_off00002fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE7 22600 bytes
SHA-256: 355ed5d873b191c2b4cf426fc71733189dcddf0294503fb570f93f838235226c
font_01_sfnt_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 19052 bytes
SHA-256: f1c402a5b139f7054ce39ccfb5800536152a5b826a5c5a7ec81e6f9b67a9d2f8