Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6c77d4678e6891…

MALICIOUS

PDF

45.6 KB Created: 2021-05-10 22:38:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1277c054a67bc39064806305d191177b SHA-1: e29c0cd582d5ed6380442392c486e45b41d3ae1f SHA-256: 4e6c77d4678e689170672410d11b32a6081ac20b9c453fadaa71967019626850
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. These links redirect to malicious infrastructure, specifically a known redirector. The document body and embedded links suggest a scam related to in-game currency and cheats for popular games like Coin Master and Roblox. No scripts were extracted, but the primary attack pattern involves social engineering via deceptive links.

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/406889139/coin-master-spins-free-2021-game-hack In PDF document text
    • http://global-brand.net/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/chisel-and-bits-mod-pe_GM479516143.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
stream_003_off000049ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AC 25736 bytes
SHA-256: d09e6172f27377cc01df887f48b347ce15a35778bbefb8094f4cc761774e1d68
font_01_sfnt_off00008241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8241 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00008fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC9 18288 bytes
SHA-256: 41f21d94c3c0473acc3506ca33b951da9505e1643d81a04a8bd875c9ca2f7515

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