Malicious PDF — malware analysis report

Static analysis result for SHA-256 1add81a3f7dfa4bf…

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 10:15:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1fc1e648d23821ba5295308c90717ed5 SHA-1: 7205e8d0019f79c7729b5064560f81b81168730a SHA-256: 1add81a3f7dfa4bfc0181ac7ca9828c340d0d49cf8c14be13113abe2036e344a
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which are SEO-optimized and point to game-related content, suggesting a link farm or phishing lure. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a call-to-action phrase further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/coin-master-game-hacking-tricks-game-hack
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-app-for-iphone_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/coin-master-cracked-apk-free-download_GM406889139.pdf
    • http://muslib.unmus.ac.id//repository/coin-master-homepage_GM406889139.pdf
    • http://muslib.unmus.ac.id//repository/hack-coin-master-using-pc_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/minecraft-online-free-download_GM479516143.pdf
    • http://muslib.unmus.ac.id//repository/sites-to-get-free-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/robux-generator-without-verification_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-12-km-eggs_GM1094591345.pdf
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/roblox-bloxburg-hack_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-no-verification_GM406889139.pdf
    • http://muslib.unmus.ac.id//repository/master-free-spin_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • http://muslib.unmus.ac.id//repository/pubg-uc-shop-myanmar_GM1330123889.pdf
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/coin-master-pet-food-free_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/daily-free-spin-and-coin_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/hack-coin-master-game-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005208.bin
e6c56dcf38159e62b0aedd3ccaa12cce86f5b08d309d49cb46063620d079ac9f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5208 27836 bytes
font_01_sfnt_off000092dc.bin
30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92DC 2840 bytes
font_02_sfnt_off00009c8f.bin
e6eeb4c177e5eee4d6ed34054a731a6c1f0233db213bcc63fafd9e052183041d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8F 18264 bytes

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