Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f18b3bad045f67…

MALICIOUS

PDF

37.1 KB Created: 2021-06-09 14:07:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d6a0df963aec0c1c6ecb76e0b3d82bea SHA-1: 3b47ef50c4b03ee59ae668417564bddd823b4aa3 SHA-256: f5f18b3bad045f67c79364a32bb405b92bd6355352df51965516a8b5d9a51b10
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators' to entice users. The heuristic firings confirm these links lead to known malicious redirectors and lure users with game-related content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.tw/app/431946152/roblox-jailbreak-hack-keycard-game-hack In PDF document text
    • https://mbbs.hr/files/free-roebucks_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/block-best-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-airpods-tiktok_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004cb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB0 32520 bytes
SHA-256: 256c6446018e801b2a32d2ef889cb41b765d6ddc2234dec4595f77ead9f8063a