Malicious PDF — malware analysis report

Static analysis result for SHA-256 b831f5238ea028e4…

MALICIOUS

PDF

43.2 KB Created: 2021-05-14 02:38:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 67bf764dda1819f3d6d87dcbfb5f5e0c SHA-1: eb4cedc31501ed0a094f446a5d778dc0b80ab43f SHA-256: b831f5238ea028e4fe8c85f269299d8226732f8f1f6a909ff5dc62bbef4e4b1a
62 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a prominent call-to-action related to obtaining free Robux, a common lure for phishing and malware distribution. The presence of a callback lure suggests potential for further social engineering or scamming tactics. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/robuxlove-.net-free-robux-game-hack
    • https://knowledgekingdom.com.jo/aidata/blanc/files/get-free-gold-cards-in-coin-master_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-robux-gift-card-generator_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-hacks-2021_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-robux-codes-2021-real_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-hack-to-get-robux_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/roblox-login-hack_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-minecraft-mods_GM479516143.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/gameoffice-net-hack-coin-master_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/orewards-com-free-robux_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-apk-hack-32_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-spin-coin-master-today_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-free-spin-today-2021_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/minecraft-pocket-apk_GM479516143.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-spins-2021_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/roblox-generator-no-human-verification_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-free-spin-link-new_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047fa.bin
5c8d814df814cb0d73ae8b86eb5fc43cf02b20f45d81d3b3294eb488a311fe98
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FA 27204 bytes
font_01_sfnt_off0000864c.bin
65db4e182113fd1a8aa6d8046ef53f92d54fa7b6a505b130f920b75136a01eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x864C 18372 bytes