Malicious PDF — malware analysis report

Static analysis result for SHA-256 f495d799959a583b…

MALICIOUS

PDF

42.2 KB Created: 2021-05-13 09:30:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fd7c48e355ae5ef8dd99e50e51ad91f0 SHA-1: 4c4640e711a9db4f4fe6e572faec0d4c8f18d8c3 SHA-256: f495d799959a583be8237c89b3bf28d27c8fd3f68cee2b8ff75b8c4ec2eb1f32
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/coin-master-free-spins-and-coins-link-haktuts-game-hack PDF link annotation
    • http://ggmtc.net/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/100-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/collect-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.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
font_00_sfnt_off00004ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC8 24308 bytes
SHA-256: 85a231d98da7fa4ba27534d9e2d4ec999ac0659961842fe98d0281ad3585e0db
font_01_sfnt_off00008282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8282 18372 bytes
SHA-256: d0160522c9507928c114f36e82183f3878c9bb5f52b4c502e96d0270f56f9c5a

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