Malicious PDF — malware analysis report

Static analysis result for SHA-256 23adfb62594cbcb9…

MALICIOUS

PDF

57.8 KB Created: 2021-06-02 09:01:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 76b2580976e941f6679b7b7eadad9500 SHA-1: 44ffc5f69b6c878c632dda2c5cd75b0069cf8c9d SHA-256: 23adfb62594cbcb92852d0b127ef7559b1205edb1955a5c6b4d787cb6d67db60
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, identified as a link farm, pointing to websites offering 'free Robux' and 'free spins' for games. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many external URIs suggest a malicious intent to redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9717

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.xyz/app/431946152/roblox-free-merch-game-hack PDF link annotation
    • https://ogm-goettingen.de/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/get-free-robux-easiest-way_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-coin-master-app_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://ogm-goettingen.de/images/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-roblox-hair-girl_GM431946152.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_004_off000053a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A8 29248 bytes
SHA-256: cd313db2ffb572d24b92aaf6ce27b9e6c90c3d6b6f3742bebc78632afb9dcf40
font_01_sfnt_off0000978f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978F 13040 bytes
SHA-256: baaad5478f18a2b39a4da17c9a0251aeb576ef11acd065fa4de5643523634019
font_02_sfnt_off0000c035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC035 18308 bytes
SHA-256: 53392700b70aa83199da0569a4f57d40725388ebaee92795270cf0c39ba22b8d

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