Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef515f40722f824c…

MALICIOUS

PDF

48.8 KB Created: 2021-05-19 13:01:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1c5feae61245bb97505438db0e9cc595 SHA-1: b7cc03aca05e01f27135032c03eb40601f8e5887 SHA-256: ef515f40722f824cdfe16c3329c5d50dc61938487afa0f8bcf211e53043f93e1
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are structured as a link farm, suggesting an attempt to drive traffic to malicious sites. The document body, though truncated, indicates a lure for 'Free Robux' and includes instructions to disable security software, a common tactic in social engineering attacks. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/431946152/free-robux-without-human-verification-game-hack
    • http://pizzeria-rosso.pl/images/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/facebook-coin-master-free-spins_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/free-spins-coin-master-2021-hack_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/minecraft-bedrock-hacks_GM479516143.pdf
    • http://pizzeria-rosso.pl/images/roblox-2021-hack_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/free-spins-coin-master-links-2021_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/coin-master-free-spins-coins_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/appsmob-info-coin-master-hack_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/coin-master-400-spin-link-today_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/get-free-robux-2021_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/free-coins-coin-master-hack_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/how-to-get-free-robux-youtube_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/coin-master-card-collection-link_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/free-800-robux_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/can-i-play-roblox-for-free_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/free-robux-with-no-verification_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c67.bin
e77f673377b45d08cce1c7a902d714ce8aa554d6e65897852d12cb978f2f153a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C67 27960 bytes
font_01_sfnt_off00008c8d.bin
43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8D 3992 bytes
font_02_sfnt_off000099b4.bin
69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399
pdf-font-stream PDF embedded font (sfnt) at offset 0x99B4 19224 bytes