Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b07b72bcd0aa325…

MALICIOUS

PDF

42.1 KB Created: 2021-05-14 02:00:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8271fc3a9208d2ae2edcc943eed3560b SHA-1: a7c5e734accbf7a258e9349a6f2273b832835990 SHA-256: 2b07b72bcd0aa325bacd402fd013cd113ab013c226b108fb1a3dcf87afcba68c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which are SEO-optimized PDF links designed to attract users searching for free in-game currency or items. The ML classifier strongly indicated maliciousness, and the presence of a "download button" heuristic suggests a deceptive call to action. The document body and extracted URLs point towards a lure for free Robux or Coin Master spins, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-spins-coin-master-2021-glitch-game-hack
    • https://bancroftandsons.com/images/free-robux-generator-without-verification_GM431946152.pdf
    • https://bancroftandsons.com/images/coin-master-free-spins-activegamer_GM406889139.pdf
    • https://bancroftandsons.com/images/coin-master-hack-iosgods_GM406889139.pdf
    • https://bancroftandsons.com/images/coin-master-daily-spin-link-app_GM406889139.pdf
    • https://bancroftandsons.com/images/roblox-printables-free_GM431946152.pdf
    • https://bancroftandsons.com/images/get-free-coins-on-coin-master_GM406889139.pdf
    • https://bancroftandsons.com/images/roblox-promo-codes-2021-robux_GM431946152.pdf
    • https://bancroftandsons.com/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://bancroftandsons.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • https://bancroftandsons.com/images/113-hacked-client_GM479516143.pdf
    • https://bancroftandsons.com/images/coin-master-ids-for-free-spins_GM406889139.pdf
    • https://bancroftandsons.com/images/free-robux-with-no-human-verification_GM431946152.pdf
    • https://bancroftandsons.com/images/get-free-robux-no-human-verification_GM431946152.pdf
    • https://bancroftandsons.com/images/coin-master-server-hack_GM406889139.pdf
    • https://bancroftandsons.com/images/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • https://bancroftandsons.com/images/how-to-really-hack-coin-master_GM406889139.pdf
    • https://bancroftandsons.com/images/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • https://bancroftandsons.com/images/how-to-make-robux_GM431946152.pdf
    • https://bancroftandsons.com/images/how-to-block-someone-on-coin-master_GM406889139.pdf
    • https://bancroftandsons.com/images/roblox-points_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049dd.bin
c8d465bc01d5cb0fced5cd06aaf7ebdc3baa326761128174fa177fc58a6dbf8a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DD 24324 bytes
font_01_sfnt_off00008156.bin
8c6d4bd1280aaca7551541ea66dfc454f80fb022d039b81e2f7b76bbe9834590
pdf-font-stream PDF embedded font (sfnt) at offset 0x8156 18528 bytes