Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb62f1a721a87a1…

MALICIOUS

PDF

45.2 KB Created: 2021-05-14 16:24:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9a27aaf5498b4924aa3a3871ceca1bf1 SHA-1: 775a383547724f57956f9ebcc62fcba9d0221c61 SHA-256: 8bb62f1a721a87a1e5c1e5b5ff7364235ba2f212ed71df96b35681f8e5bb51a4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized slugs pointing to game-related cheat sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm or redirection to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely attempt to direct users to potentially harmful content, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/how-to-hack-coin-master-ios-no-jailbreak-game-hack
    • http://www.drent.se/images/how-do-you-get-robux_GM431946152.pdf
    • http://www.drent.se/images/free-spins-coin-master-no-survey_GM406889139.pdf
    • http://www.drent.se/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://www.drent.se/images/coin-master-free-spin-and-trading-group_GM406889139.pdf
    • http://www.drent.se/images/free-spins-coin-master-2021-glitch_GM406889139.pdf
    • http://www.drent.se/images/coin-master-free-coins-cheat_GM406889139.pdf
    • http://www.drent.se/images/2021-free-spins-coin-master-link_GM406889139.pdf
    • http://www.drent.se/images/coin-master-free-spins-app_GM406889139.pdf
    • http://www.drent.se/images/coin-master-400-spin-link-today_GM406889139.pdf
    • http://www.drent.se/images/coin-master-hack-com_GM406889139.pdf
    • http://www.drent.se/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://www.drent.se/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://www.drent.se/images/free-robux-no-verification_GM431946152.pdf
    • http://www.drent.se/images/coin-master-free-spins-and-coins_GM406889139.pdf
    • http://www.drent.se/images/how-to-hack-and-get-free-robux_GM431946152.pdf
    • http://www.drent.se/images/coin-master-facebook-hack_GM406889139.pdf
    • http://www.drent.se/images/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.drent.se/images/free-coins-coin-master-2021_GM406889139.pdf
    • http://www.drent.se/images/60-free-spins-coin-master_GM406889139.pdf
    • http://www.drent.se/images/coin-master-rewards-app_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004987.bin
13070ef0ac82942595100f183db248923522b3be7aa35b4d3cc5675262f1d857
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4987 24784 bytes
font_01_sfnt_off0000818a.bin
c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x818A 3560 bytes
font_02_sfnt_off00008e10.bin
245da73fd6a4adf64d20a0032a195ec6168575235dd94336deea9f66564d80a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E10 18280 bytes