Malicious PDF — malware analysis report

Static analysis result for SHA-256 a873727a1575d518…

MALICIOUS

PDF

44.8 KB Created: 2021-05-31 23:03:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 79e80a776003bc47fdf6c4b911566a78 SHA-1: a7125592f48468cf7c18526bdc24e12f3f947122 SHA-256: a873727a1575d5188936e4bfcaef83253d6fac71c542df3e76e1772a4adbbf0d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The document body, though truncated, includes a URL related to 'free t-shirt in roblox game hack', suggesting a lure for game-related exploits or scams. The presence of a ML classifier flagging the PDF as malicious and a heuristic identifying a link farm strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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.xyz/app/431946152/how-to-get-free-t-shirt-in-roblox-game-hack
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/account-hacked-roblox-reddit_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-cheats-for-robux-with-inspect_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/mode-de-hack-sur-roblox-bee-sarwn-simulator_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/apps-to-get-free-robux_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-robux-hack-download-free-2021_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-offers_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/haktuts-coin-master-free-spins_GM406889139.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-hack-no-scam-robloxian_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-hack-work-at-a-pizza-place-roblox-2021_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/minecraft-iphone-free_GM479516143.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/tiktok-followers-for-free_GM835599320.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/5-games-that-give-out-free-robux_GM431946152.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-minecraft-coloring-pages_GM479516143.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/minecraft-marketplace-free_GM479516143.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/tiktok-follower-bot-free_GM835599320.pdf
    • https://zbych-pol.pl/wp-content/uploads/fsqm-files/robloxgiveaway-xyz-roblox-online-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_off000052f1.bin
2e42085a07929d366207233ade8c35a8a0d8ce11642cf0c78c30d4e5ef8ba099
pdf-font-stream PDF embedded font (sfnt) at offset 0x52F1 24880 bytes
font_01_sfnt_off00008c00.bin
9c3cd2b0c386f966ff3921612947fde456fb82abb4ce787619edaa774767d81d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C00 18500 bytes