Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16bfd15266113dd…

MALICIOUS

PDF

43.4 KB Created: 2021-05-19 08:56:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 874c88a6670846ef85c8a76399bd601e SHA-1: 3b827dc78f4c7bc0faca59c5e3d95f68b7366df2 SHA-256: d16bfd15266113dd5c33fca7cac4742f30122c9c977a7bef07406425f74b4cb9
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to game-related hacks and free items. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests a link farm or phishing attempt. The document body, though heavily corrupted, contains URLs that align with the heuristic findings, indicating a likely attempt to direct users to malicious websites for potential malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/835599320/will-tiktok-free-view-bot-game-hack
    • http://apostolosandreaslemesou.com/images/_GM479516143.pdf
    • http://apostolosandreaslemesou.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/rbx-sites_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/coin-master-hacks-no-downloading_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/coin-master-free-spin-daily-bonus_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/cheats-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/coin-master-mod-version-free-download-2021_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/http-coin-master-hack-club_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/how-to-get-free-hats-on-roblox_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/master-coin-master-free-spin_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/free-printable-roblox-images_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/game-toolbox_GM479516143.pdf
    • http://apostolosandreaslemesou.com/images/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/free-robux-only-username_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/is-free-robux-real_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/robux-com-free-robux_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a5a.bin
87d7450df2d68817a9734a6b70e14efc9e8ada1bc65190fc11c5cfe5f42006a8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A5A 28280 bytes
font_01_sfnt_off00008740.bin
66eba3628fb9958d504d172934cd7d4392a5f8bf3da127311e078a56b4435d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8740 18244 bytes

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