Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aa69f6bd5eb508…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 06:01:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f888c34ae1d7b4c10a860f41006677c7 SHA-1: d345f2921138b8e480a3197f85f6855162b7e4a2 SHA-256: 16aa69f6bd5eb5082e8f5d9abdcc085d427984f69969c8c86cce276982046abb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs and a document body that promotes downloading game-related cheats, indicating a phishing or scam attempt. The presence of a PDF_SEO_LINK_FARM heuristic suggests the document is designed to generate traffic to external sites, likely for malicious purposes. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/cheat-engine-for-roblox-apocalypse-rising-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-robux-in-ipad_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-spin_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-aimbot-cheat-engine_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/real-way-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-robux-easy_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_004_off000050d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D8 25272 bytes
SHA-256: f5042fdbaa088756c35f74503c5a170ca2ac867ef1deed48dde338d26abe68f8
font_01_sfnt_off00008bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD1 19212 bytes
SHA-256: 119790c0a73382b1b629a737b6ce4c53371627b5780914764049c3618e26ae7c

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