Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f6c6708b380cad…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 00:17:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0bde8190fa9ebb7d656ba8b94e4faf0d SHA-1: 810dd5f0fa6b452dc91fe9b0c73951467cd7ded5 SHA-256: 78f6c6708b380cadb59336cd93abd436beef855543f1b3b7669e0b9953018698
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) 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 0.9980

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.
  • 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 http://netcdn.co/app/431946152/card-robux-free-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3084 22252 bytes
SHA-256: 5b888a945b6c41b017a4e348da0e837a8f7de02311307d750057943d77da740f
font_01_sfnt_off000061f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F0 18888 bytes
SHA-256: 0ab8344ed9c9b32f197087b9f62eefb66129d7092a0be53febf4888c2625d880

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