Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f106f0fe78b5c5…

MALICIOUS

PDF

43.4 KB Created: 2021-05-13 07:08:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b6577833f71352a72e366865afb1adc4 SHA-1: 7b913b691c0ef6fcf27791b58334b88baa0a22ea SHA-256: 13f106f0fe78b5c5130a54ef13576ecd49d4a9a03a141f017ac12ec3b341b0c7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as a link farm for SEO purposes, suggesting a malicious intent to drive traffic to potentially harmful content. The document body and extracted URLs explicitly mention 'free Robux' and 'game hacks', indicating a lure for users interested in such topics. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/how-do-we-get-free-robux-game-hack
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-ios_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/hack-coin-master-using-cheat-engine_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/coin-master-hack-app-link_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/100-free-spins-coin-master_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/free-robux-earn_GM431946152.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/coin-master-hack-no-root_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/hack-coin-master-net_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/coin-master-ids-for-free-spins_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-apkmody_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/coin-master-get-free-spins_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/robux-com-free_GM431946152.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-verification_GM431946152.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/coin-master-free-cards-link-2021_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/blogger-free-spins-and-coins_GM406889139.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/free-roblox-clothes-codes_GM431946152.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/i-want-free-robux_GM431946152.pdf
    • https://elearning.man2tanahdatar.sch.id/__statics/gudangsoal/files/minecraft-online-free-no-download_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049bf.bin
ce358e7e0d64ad7605642fc6db9b7fca6791e94700707b3a3dd62b0f94952a1a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BF 25760 bytes
font_01_sfnt_off00008614.bin
357fc7c7eb6196ee12ed3080908575177554d85b467bf9142ee0ee232c3cf829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8614 18648 bytes

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