Malicious PDF — malware analysis report

Static analysis result for SHA-256 491f826730ba95b9…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 05:45:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b42d13dad9a6944c8fd89c98d14bb240 SHA-1: 4aaf510f61480e96c8d423e2031e3eaaa736356c SHA-256: 491f826730ba95b9ed041319859c87f9e0bce8f11c400f3187e06a8e1898a780
102 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on a link farm domain, suggesting a phishing or malware distribution attempt. The document body and extracted URLs explicitly mention 'hacked version', 'free robux', and 'coin master hack', indicating a lure for users seeking cheats or exploits. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/roblox-hacked-version-game-hack PDF link annotation
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-hack-apk-free-download_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/dragon-ball-super-2-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-cheat-engine-feb-2021_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-robux-in-one-second_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-counter-blox-hack-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F7 22608 bytes
SHA-256: 9b8f5f75bd55f0137f353c62a01b274661f14452ada391c0ab9e9d1cde902c12
font_01_sfnt_off0000633f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633F 19084 bytes
SHA-256: e30baab197ea380a830251f11993b0159206347d5302a55b978f6309ced101e7

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