Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32b876f21a9896b…

MALICIOUS

PDF

40.9 KB Created: 2021-05-17 14:04:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 90bfd4a401476a0622a3a185b83c634d SHA-1: e0d6596f90c9dc973b583407b652aaf2cd65796f SHA-256: d32b876f21a9896b605833be9f8cf9b64c03d0d6fbe7a2f8b4832c05992e897a
182 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The document also displays a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The primary URL, https://netcdn.xyz/app/406889139/how-many-levels-are-there-in-coin-master-game-hack, is associated with game hack lures, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • 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/406889139/how-many-levels-are-there-in-coin-master-game-hack PDF link annotation
    • http://pdia.de/images/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/robux-app_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004843.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4843 23616 bytes
SHA-256: 556ffca99f4f3352fac42574523e9f56625b808b11ac83da8c0cf314927184d5
font_01_sfnt_off00007d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D96 18244 bytes
SHA-256: 7a3e09ddd81ff0bf88cf020c99e068e580145ca5d489a9015f3b374a3ae3c451

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