Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1a40bc645d117a…

MALICIOUS

PDF

44.5 KB Created: 2021-05-13 19:01:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dac48d03813b225a03666c866b32630f SHA-1: 6b46f5b0be412f01ee672eea58d969bade17d6a7 SHA-256: ad1a40bc645d117aaa5934aaa2d421469b260be1478e69f2a04c791f8458d582
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are disguised as downloadable PDFs related to game hacks and cheats. The presence of a large link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The document body itself contains obfuscated text and URLs, further supporting the lure of downloading unauthorized game modifications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/roblox-2021-hack-game-hack PDF link annotation
    • http://bepquannhu.vn/upload/editor/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/oprewards-login_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/can-you-give-me-free-robux_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
stream_003_off00004a3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3D 29368 bytes
SHA-256: b8483b6477ebe5bf701fa32ae880860dce1d1665bced54ea88de08de8a12512e
font_01_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 18584 bytes
SHA-256: 0d052e0fccd73391d0e4376686c91c36ea26f223879c53cf61dff021e779cee2

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