Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3c861e9241cc88…

MALICIOUS

PDF

42.4 KB Created: 2021-05-15 02:25:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 51873c69181ed1e7b7890c690490c259 SHA-1: d20755952144b339ca0fec2694eee28c6d449b23 SHA-256: eb3c861e9241cc88d5c16d014a37eceebdafdaaba021eab15858cd91ebed701b
222 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with SEO link farms and game hack lures. The document body and heuristics indicate a deceptive pattern, presenting fake CAPTCHA or download prompts to trick users into clicking these malicious links. The primary goal appears to be redirecting users to potentially harmful sites that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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/free-bobux-game-hack PDF link annotation
    • http://mountain.mn/uploads/files/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-come_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
stream_003_off0000461e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x461E 27908 bytes
SHA-256: f75ff04d8d12925cf8e715e95e3f0ead8e0767410e45ff994bcc46e4d25ee409
font_01_sfnt_off0000841c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841C 18012 bytes
SHA-256: 21a070aee0b4453f2f1d9cb5d53691f71c1a468eb04f2ae46e30da6bacbd91e9

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