Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c704c8a00ce67c9…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 20:01:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9c4234dfc440161eeb0870c98a83a283 SHA-1: 22172caa74d728f03b2d5fed6b358100b62fa2c4 SHA-256: 6c704c8a00ce67c967e2337af3072e25f9431f83d70e5d44d178aabaea39064f
142 Risk Score

Malware Insights

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

The PDF document contains numerous links, presented as lures for free game currency and hacks, which redirect to external sites. The primary lure directs to 'http://netcdn.tw/app/431946152/how-to-get-free-robux-without-offers-game-hack', suggesting a phishing or scam attempt. The presence of a large number of similar PDF links indicates a link farm, likely for SEO manipulation or to distribute 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/how-to-get-free-robux-without-offers-game-hack PDF link annotation
    • http://www.jsvillas.com.tw/assets/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/cheat-hacks-in-roblox-bee-swarm-simulator_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/actual-free-robux-noothing-reques_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/generator-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/pokemon-go-free-stardust_GM1094591345.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_off00003067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3067 22576 bytes
SHA-256: a0372aed734590b01b900c8ac57de618cc9dc56f35b160f9bfb9f9eb40bd9d7e
font_01_sfnt_off000062e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E5 19468 bytes
SHA-256: d293dc8b17a4ec261e56b386a82f7f63f23481516d807023c0ef4741d16fdc92