Malicious PDF — malware analysis report

Static analysis result for SHA-256 872574d20a78c42b…

MALICIOUS

PDF

34.0 KB Created: 2021-06-27 01:24:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1349adbbdbbbb7ff36207c513fac9b57 SHA-1: 6a4683e3aa6e65ad659b28156ec50e8cbbea572f SHA-256: 872574d20a78c42b33f010de5261f21495343ccea52b8deb815a165eeae64ec6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, strongly suggesting a phishing or malware distribution attempt. The document body and extracted URLs focus on lures for free in-game currency and items for popular games, indicating a social engineering tactic to trick users into clicking malicious links. The ML classifier also flagged this PDF as malicious with high confidence.

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/431946152/roblox-planet-free-robux-game-hack
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-free-bir_GM431946152.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-free-robux-2021-2021_GM431946152.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/cheats-coin-master-free-spins-and-news_GM406889139.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/minecraft-java-edition-code-free_GM479516143.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-online-free-spin_GM406889139.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-free-spin-today_GM406889139.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-promo-code-2021_GM406889139.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/is-minecraft-free-on-xbox_GM479516143.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-admin-roblox_GM431946152.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/freespins-coin-master_GM406889139.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/roblox-free-items-glitch_GM431946152.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/mosttechs-coin-master-free-spins_GM406889139.pdf
    • http://www.bcph.moph.go.th/ckfinder/userfiles/files/cm-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e16.bin
7cd59a78d8e62ca40e5faf38f32502d30519eabcd0c27f62de65cb3b9bc6da00
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E16 22352 bytes
font_01_sfnt_off00005ffb.bin
180b81e2cfa67965e2621689c3be21445d9ba12cca159c118de5753565752dfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFB 19048 bytes