Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d13de98e4cd0bc…

MALICIOUS

PDF

34.5 KB Created: 2021-07-01 20:31:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fdff256a0341515a5a4f0b485a0eea83 SHA-1: 20f35a9374c6c71a69c1bc9e313d7da7f156ecba SHA-256: b1d13de98e4cd0bc135a62598e1671ce92e87b3dee643ff25afd6868331e7074
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links disguised as download opportunities for popular games and in-game currency, a common lure for malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the ML classifier strongly suggests malicious intent. The document body itself contains obfuscated text and URLs pointing to potential second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/479516143/minecraft-pc-free-game-hack PDF link annotation
    • https://rerempahanspa.com/ckfinder/userfiles/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/robux-redeem_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/videos-of-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/robux-hack-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/roblox-hack-v6-5-free-download_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • https://rerempahanspa.com/ckfinder/userfiles/files/how-to-get-free-robux-for-real_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
font_00_sfnt_off0000332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x332D 22536 bytes
SHA-256: ae007b0c79819dd38f4c57ae6725aa0e5522bb919c21d24bab8b40f742d3382c
font_01_sfnt_off00006512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 18008 bytes
SHA-256: 7b53852c349be1bc084196235092269a717ad06b6af355bc11c1fdb457e3227a

Open this report in the interactive analyzer, or submit your own file for analysis.