Malicious PDF — malware analysis report

Static analysis result for SHA-256 79141fe74a41fa13…

MALICIOUS

PDF

44.6 KB Created: 2021-05-15 06:30:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5358127fdf70a3308da1b45c9ef7fb23 SHA-1: b8f90a7cb27666d5c343d94627e3fe960775188e SHA-256: 79141fe74a41fa13b34d40f64446b31e0a177c7fb528856242e90d21e434b9b8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a link farm heuristic, indicating a strong effort to direct users to external sites. The document body and extracted URLs suggest a lure related to game hacks and free currency, a common tactic for distributing malware or conducting phishing. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to exploit user interest in these topics to drive traffic to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-game-hack
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-hack-people-in-roblox_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/rbx-free-robux_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/minecraft-apk-114_GM479516143.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/coin-master-bonus_GM406889139.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/haktuts-coin-master-free-spins_GM406889139.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-roblox-card_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/tower-of-hell-roblox-hack_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-do-you-get-robux_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/roblox-april-fools-hack_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/coin-master-spin-link-today-free_GM406889139.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-block-someone-on-coin-master_GM406889139.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-ways-to-get-robux_GM431946152.pdf
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/ways-to-get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a34.bin
74fc8a542e12dd4a56afddd6825290a78f7aae67680fa42841b8ed5e4b69665f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A34 23768 bytes
font_01_sfnt_off00007fff.bin
dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFF 4020 bytes
font_02_sfnt_off00008d87.bin
0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D87 17712 bytes

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