Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d91b63ebbb6ff9…

MALICIOUS

PDF

42.7 KB Created: 2021-05-15 06:36:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 42700b90584bcaa6a3256b87fd0ad078 SHA-1: 558c3bc430bffe6069ab47229ca2e76c1dce31ee SHA-256: 52d91b63ebbb6ff95a00dd5df39a2ae746d04bf4229b52a8bd19b354ecc3601f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to websites promising free game hacks and Robux, a common lure for phishing and scam operations. The heuristic firings confirm these links point to malicious redirector infrastructure. While no scripts were directly extracted, the nature of the lures and the embedded URLs suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-make-free-robux-game-hack In PDF document text
    • https://ase-sinaloa.gob.mx/images/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/free-robux-real_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/minecraft-hacks-pc_GM479516143.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_off000048b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B7 25292 bytes
SHA-256: 096000c959d57555381a968543f1a2979acf2c4e3b1872897b0a81f62084722d
font_01_sfnt_off00008353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8353 18772 bytes
SHA-256: bc975d0cd3d1d09474d4302e54d359df6d5266f7e81f0636855fd998b44c4aca

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