Malicious PDF — malware analysis report

Static analysis result for SHA-256 5408ca74c492dcdc…

MALICIOUS

PDF

34.2 KB Created: 2021-06-26 14:53:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a8bf0f8c2fe880ec70be56d9bffc5acd SHA-1: 3bca2633139b5651b8520cfbc9f88517b5ceebcb SHA-256: 5408ca74c492dcdc785be9be55e521e14299ae467726ee184129d06f78364d87
122 Risk Score

Malware Insights

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

This PDF file exhibits a high confidence malicious classification, primarily due to its structure containing a large number of external links. The document body and extracted URLs suggest a lure for free in-game currency (Robux, Coin Master spins) which likely leads to the download of further malicious content. The presence of a link farm and a direct IP address link indicates a deliberate attempt to distribute potentially harmful files.

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.co/app/431946152/howe-to-get-robux-for-free-game-hack
    • http://122.201.26.170/files/editor/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/how-to-get-a-free-dominus-in-roblox_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/free-robux-zephplays_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/free-spins-coin-master-daily_GM406889139.pdf
    • http://122.201.26.170/files/editor/files/youtube-how-to-get-free-robux_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/free-coin-master-spins-2021_GM406889139.pdf
    • http://122.201.26.170/files/editor/files/how-to-get-free-robux-on-android_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/hack-crack-for-coin-master-currency_GM406889139.pdf
    • http://122.201.26.170/files/editor/files/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://122.201.26.170/files/editor/files/free-arsenal-hacks_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://122.201.26.170/files/editor/files/roblox-free-rubox_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/coin-master-facebook_GM406889139.pdf
    • http://122.201.26.170/files/editor/files/coin-master-hack-programers_GM406889139.pdf
    • http://122.201.26.170/files/editor/files/play-games-and-get-free-robux_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/minecraft-pe-free_GM479516143.pdf
    • http://122.201.26.170/files/editor/files/how-to-get-free-robux-no-verification-or-survey-2021_GM431946152.pdf
    • http://122.201.26.170/files/editor/files/minecraft-bedrock-hacks_GM479516143.pdf
    • http://122.201.26.170/files/editor/files/tower-of-hell-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fb3.bin
2135c1ebe9e5290bfcd2c5323b6ba66f73115266bf84e840430a1952acd1e6e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB3 22084 bytes
font_01_sfnt_off00006098.bin
44ce78d80712875137b0a231163bd7aca5a4f1f3ab87d3a3c0f5a2e26522b7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6098 18984 bytes