Malicious PDF — malware analysis report

Static analysis result for SHA-256 07591f50c238affc…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 19:45:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c038a016c8e49962ddd479d3197b5700 SHA-1: 1ae43942dce0e5eb35100cc7b6a48aae9d220122 SHA-256: 07591f50c238affc5dd5276ee334c7fa5224a8b3b995160cd3b207316b33d1f6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to malicious redirectors and SEO link farms, masquerading as game hacks and generators. The document body, though heavily obfuscated, contains URLs that align with the heuristic findings of malicious redirector links and a link farm. The primary goal appears to be directing users to potentially malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • 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.
  • 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
  • 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/roblox-install-free-game-hack In PDF document text
    • https://servotecnica.com/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • https://servotecnica.com/images/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • https://servotecnica.com/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://servotecnica.com/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA3 25224 bytes
SHA-256: 61db8ed1a6733aa64e33786fbbb3f6a7d2c55cb700181e549126e1a6f36aeffb
font_01_sfnt_off00008491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8491 2984 bytes
SHA-256: 2df87bbe4e27b27e34c872c092d0522acd977d05f5cbde7ed5e1fdfeb59cb318
font_02_sfnt_off00008ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDE 18280 bytes
SHA-256: 3c3a3b9ea50be1288d4e90d28d6823d5d0e7fce454efe1523ba787caa6fa0fc3

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