Malicious PDF — malware analysis report

Static analysis result for SHA-256 955cacdbca00aefc…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 15:29:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3fbaefa94c639b2b5ea05a0251cd4234 SHA-1: 39cad268df647a057bbc8b12b4f4d6d884296176 SHA-256: 955cacdbca00aefc05d7204e91c78fce2506219c07ae522309c423f369fbf86e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains multiple links to redirector domains, which in turn host other malicious PDFs. The ML classifier strongly indicates malicious intent, and the presence of numerous links to potentially malicious infrastructure supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/microsoft-bing-free-robux-game-hack In PDF document text
    • http://rollipolli.hu/userfiles/files/free-catalog-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-get-free-tickets-in-roblox_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-one-piece-millenium-hack-no-script_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-how-to-get-free-animation-packs_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-robux-hack-no-survey-online_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-cbro-skins-free_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/cheat-roblox-vicule_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-and-roblox_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-cheat-money-in-jailbreak_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-install-minecraft-for-free-on-ios_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
font_00_sfnt_off00003048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3048 21856 bytes
SHA-256: 4380958316de25bae99e61b5e927309f0401e509ce0346897c5f92f49c0d6d9c
font_01_sfnt_off000060ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BA 19136 bytes
SHA-256: 6574868ecd516cdc95e6406792cdbd3216c6b5fe6b50fcaddc0876f557b9cdc5

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