Malicious PDF — malware analysis report

Static analysis result for SHA-256 633985ad3b1edc86…

MALICIOUS

PDF

43.7 KB Created: 2021-06-09 01:53:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 74dbdb7fe05f4712b0b4615b459411cd SHA-1: 5cc3878aa88ece60c801263282182412da3dddc1 SHA-256: 633985ad3b1edc862e59a6401d94678c0bf6a76bb76ca0d795e6a7bcd45ea990
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm heuristic, suggesting it is designed to redirect users to external sites. The document body and extracted URLs indicate a lure for free in-game currency or hacks, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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
  • 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.tw/app/431946152/how-to-sign-in-roblox-for-free-game-hack PDF link annotation
    • https://reggieslockandkey.com/images/5-million-robux-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-free-robux-download_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-free-300-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-on-mobile-device_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-without-verifying_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
stream_004_off00004f42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F42 24568 bytes
SHA-256: 9d833dfa3c12daa14a6087ba926713664532c3711a768623a573ee3aa53b2e8b
font_01_sfnt_off00008758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8758 18520 bytes
SHA-256: 96706a16bff0995f3f1cdf9e90306b7bbe3273e8e421c9a3dc89f7403025a890

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