Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac488a0ba677346…

MALICIOUS

PDF

44.3 KB Created: 2021-06-07 12:08:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2829dfae07f2d0502134e622a557c7af SHA-1: dced9b42416c035f394b9c864b8350d28848dd8b SHA-256: 8ac488a0ba6773467c64a71778491c165d80cd9682a954eb631019b2ef92bd70
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external links, many of which are SEO-themed and point to potential game-related exploits or cheats. The presence of a fake CAPTCHA lure strongly suggests an attempt to trick the user into clicking these links, which likely lead to malicious content or further compromise. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.tw/app/431946152/robux-codes-free-for-bots-game-hack
    • http://immo360grad.com/images/free-spin-link-coin-master_GM406889139.pdf
    • http://immo360grad.com/images/how-to-hack-mcpe-master-coins_GM406889139.pdf
    • http://immo360grad.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://immo360grad.com/images/coin-master-free-spin-redeem-code_GM406889139.pdf
    • http://immo360grad.com/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • http://immo360grad.com/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://immo360grad.com/images/free-rare-cards-for-coin-master-christmas_GM406889139.pdf
    • http://immo360grad.com/images/coin-master-free-spin-link-app_GM406889139.pdf
    • http://immo360grad.com/images/moonactive-free-spins-link_GM406889139.pdf
    • http://immo360grad.com/images/avatar-roblox-game_GM431946152.pdf
    • http://immo360grad.com/images/roblox-dominus-free_GM431946152.pdf
    • http://immo360grad.com/images/minecraft-windows-10-free-with-java_GM479516143.pdf
    • http://immo360grad.com/images/coin-master-free-online_GM406889139.pdf
    • http://immo360grad.com/images/roblox-studio-free_GM431946152.pdf
    • http://immo360grad.com/images/free-robux-no-bot-check_GM431946152.pdf
    • http://immo360grad.com/images/lazyblox-com-free-robux_GM431946152.pdf
    • http://immo360grad.com/images/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://immo360grad.com/images/pokemon-go-free-98_GM1094591345.pdf
    • http://immo360grad.com/images/coin-master-hacks-that-actually-work_GM406889139.pdf
    • http://immo360grad.com/images/how-to-get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005064.bin
d3bf5059573839efa7553989b0ee13cab300cf5bc2a53c55cf81c4471aab98a7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5064 24996 bytes
font_01_sfnt_off00008a5f.bin
20ef68898ff8b3e4d00de90c90312b8d34a0ed51b12edc35ff67a162e8e8e32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5F 18292 bytes

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