Malicious PDF — malware analysis report

Static analysis result for SHA-256 472cb4d04aa1ebd1…

MALICIOUS

PDF

49.6 KB Created: 2021-06-03 07:27:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6ab20d4826bc9673d9d4b997af070fa SHA-1: 8868dc1434750812b24ff763932d1beeb20628d2 SHA-256: 472cb4d04aa1ebd1d713fc1cfadc49993ffb4cb7e9e0b3318ccc19037444918f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm or SEO spam, embedding numerous links to external PDF files, many of which appear to be related to free game items like Robux and Minecraft hacks. The primary URL, 'https://netcdn.online/app/479516143/minecraft-sign-up-free-game-hack', suggests a lure for free game content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, reinforcing the spam/lure nature of the document. While no scripts were extracted, the sheer volume of embedded links and the ML classifier's high confidence score suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

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/479516143/minecraft-sign-up-free-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C5 25592 bytes
SHA-256: 843edc5143e7ec3f1a77ee3e95d6dc6b9711506871145bb10b25c041edf6ce22
font_01_sfnt_off00008ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE2 3020 bytes
SHA-256: eedce20c19bed174ebe453a0c0095ca54ef1c0cf763914f699a20348cea05fc2
font_02_sfnt_off00009536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9536 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_03_sfnt_off00009f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F47 18220 bytes
SHA-256: 6236314a17f57ecfc4f63da4a6b9cb2d9143cd94f6dcae1b1ce204d4da3deb21

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