Malicious PDF — malware analysis report

Static analysis result for SHA-256 85efb6092a883b2c…

MALICIOUS

PDF

46.5 KB Created: 2021-06-04 03:31:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 25613b58aceca553847e4ea8a8e7fbc1 SHA-1: 73d810138c37f33d3d2d0f87bb8378968701b3cf SHA-256: 85efb6092a883b2c199123348aa97cb3116d8136ccfbb5de217bcbb54eb6801c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, forming a link farm, and a primary external URL related to game hacks and free spins. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/free-coins-and-spins-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-cp_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/tiktok-free-liker-apk-download_GM835599320.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000507c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507C 25976 bytes
SHA-256: e3a77910603f28d441843f152b20e52dabbcd067fce52554689de7ed2c4b6caf
font_01_sfnt_off00008b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B08 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000094bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94BB 17728 bytes
SHA-256: e3d0b8926ee7e267670c6470891f76c6f1adfe71673e36adb63f096bfed3a95a

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