Malicious PDF — malware analysis report

Static analysis result for SHA-256 3521f8b129b4dfc9…

MALICIOUS

PDF

42.0 KB Created: 2021-05-13 16:30:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3f87f0aa365e03ef3a74dfa7fd10a169 SHA-1: 61c394d0456457852c3eeda529854b55b2a880ce SHA-256: 3521f8b129b4dfc9559f3ba8e6a522c5efde44bd7ddbce7acdf8f3b15fda8354
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a 'PDF link farm', which are likely intended to redirect users to malicious websites or download further payloads. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a call-to-action phrase reinforces the phishing or SEO spam lure. No scripts were extracted, but the structure and link farm suggest a malicious intent to drive traffic or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-free-coins-link-facebook-game-hack
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/roblox-studio-free-robux_GM431946152.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/free-apk-mods-coin-master_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/get-free-spins-in-coin-master_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/free-robux-only-1-step_GM431946152.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/coin-master-free-card-link-today_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/coin-master-heaven-links_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/how-do-you-get-minecraft-for-free_GM479516143.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/play-roblox-free-online_GM431946152.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/hack-coin-master-for-iphone_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/free-spin-coin-master-hack-2021_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/20-free-spin-link-coin-master_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/how-to-get-free-cards-in-coin-master_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/roblox-skin-free_GM431946152.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/coin-master-hack-ios-download-2021_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/hack-coin-master-game-apk_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/free-old-roblox-accounts_GM431946152.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins_GM406889139.pdf
    • https://elearning.man1inhil.sch.id/__statics/gudangsoal/files/coin-master-cards-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a07.bin
acb2b333b0f2321534f42a92f7b06609200fa1837d6abff09d141c278543b7d4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A07 24484 bytes
font_01_sfnt_off00008274.bin
63f6a73c8fcac7a0296ba30c45c7d116406f1db46acc5b5307ffbf1c764f0ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8274 18040 bytes

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