Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fe11439ad395ea…

MALICIOUS

PDF

47.4 KB Created: 2021-06-11 02:53:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 42a72a8a1a2dbce047aecf95a6253d01 SHA-1: a4cc53996e95eb96ead4cd79aba0d2886ace4935 SHA-256: e8fe11439ad395eaedf498039b3530c99744c43435f8ef5180995966addd17f4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'download button' lure, strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to external sites, likely for malware distribution or further phishing. The primary lure is a fake offer for free Robux.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-unused-robux-cards-game-hack
    • https://repository.stikesindramayu.ac.id/repository/is-roblox-hacked_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-app_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdf
    • https://repository.stikesindramayu.ac.id/repository/roblox-codes-cheats_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/cool-minecraft-hacks_GM479516143.pdf
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spin-no-offers_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/coin-master-hack-free-spins_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-real-working_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/coin-master-hacks-for-iphone_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-robux-on-roblox-for-free-easy_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-robux-fast_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/coin-master-card-hack-app_GM406889139.pdf
    • https://repository.stikesindramayu.ac.id/repository/free-robux-without-human-verification_GM431946152.pdf
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • https://repository.stikesindramayu.ac.id/repository/chat-hack-roblox-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fab.bin
da9f1192dab8bc34e90170a3dd6a2edd09d741d3610d4277a59841a480e9229b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FAB 25076 bytes
font_01_sfnt_off00008894.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8894 3884 bytes
font_02_sfnt_off0000953c.bin
4857efbf26e2981a37ad8573cbffadd787ef5fb60707be828a51eea786e87260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x953C 18604 bytes

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