Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c135f1f768ed3cb…

MALICIOUS

PDF

43.2 KB Created: 2021-05-18 03:34:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 05e0168d2bb5daf3aea093d8b08ba0a5 SHA-1: cbbbb9986ee7023d3fe97cec460e157399042ab8 SHA-256: 1c135f1f768ed3cb9d77186bda412a0465171bdf646dc6f9aa564db2ef49e05e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The document body, though partially corrupted, contains text related to obtaining free Robux, reinforcing the lure. The primary malicious link identified is https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-email-game-hack, which is part of a known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • 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/how-to-get-free-robux-without-email-game-hack In PDF document text
    • https://mixdoors.ru:443/images/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • https://mixdoors.ru:443/images/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/robux-free-online_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-level-4_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/robux-2021_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-robux-no-human-verification-or-survey-2021_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_off00004d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D16 23860 bytes
SHA-256: 6ee064930a2b5e887b0b87a6e4ac5fb5b8b84214bb58369df28c1fcaf7a49983
font_01_sfnt_off00008356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8356 19328 bytes
SHA-256: 2bb545c14ce80967bc964a539ce1fba7d75b9199f0e299556cda79647f99e488

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