Malicious PDF — malware analysis report

Static analysis result for SHA-256 656df2d5e882ac47…

MALICIOUS

PDF

42.3 KB Created: 2021-05-12 23:00:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 061192e367066a004392eb2aef077f93 SHA-1: f93545df36518bb03c0154f2db266439cf382328 SHA-256: 656df2d5e882ac4742afeac151cb58d8dd6e6eed5a64532b871a7edbd35628ed
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are related to game cheats and free in-game currency, suggesting a lure for users to download potentially unwanted or malicious software. The ML classifier and PDF link farm heuristics strongly indicate malicious intent. The presence of a 'download button' lure further supports this, though the specific payload is not directly executed from this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/avatar-roblox-game-game-hack
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-coin-master-coins-and-spins_GM406889139.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-spin-link-in-coin-master_GM406889139.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-robux-gen_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/coin-master-free-link-2021_GM406889139.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/roblox-imagine_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/download-hack-coin-master_GM406889139.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/roblox-play-now-for-free_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-robux-generator-no-survey_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/roblox-adopt-me-free-pets_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-generator_GM406889139.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-to-play-minecraft-servers_GM479516143.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/real-minecraft-for-free_GM479516143.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/www-rubux_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/free-hacks-for-coin-master_GM406889139.pdf
    • https://daring.mtsn7sumedang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004923.bin
87460e6ce6bab3273dff6ecce8d34cf91d0217e098a8fa9c2f47f8b650281c3c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4923 24804 bytes
font_01_sfnt_off0000821c.bin
6f25c8042a3cd2790e062f52c9c9b29641286f32198afb86083f56b8b0f15126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821C 18492 bytes

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