Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b54cf0910c6a7a…

MALICIOUS

PDF

42.8 KB Created: 2021-05-17 08:44:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ab2fe37d48d50e9398e365a986c07208 SHA-1: 2b1b63491b7ed5b2e31762cfdce31530eade7f2f SHA-256: 05b54cf0910c6a7a935e8d97717df1d7f4157af1fde7d73abc8f1a42cec96a40
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are structured as a link farm, suggesting an attempt to drive traffic to various hacking-related content. The primary URL points to "unlimited-robux-game-hack", reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/unlimited-robux-game-hack PDF link annotation
    • http://sbm-nn.ru/images/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-rewards-app_GM406889139.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_off000047f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F8 25992 bytes
SHA-256: fc82b573aa635866c134f60132477b78b3b2d758dbd55371db38a7634fac875d
font_01_sfnt_off00008385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8385 18768 bytes
SHA-256: e6f43664123b30e8a11c386baeda00565b0269c6558a5a6efce4e8dd844d6876

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