Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d768b59e0742f2…

MALICIOUS

PDF

48.9 KB Created: 2021-05-13 12:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5f5641be1f2db2dca80896e7eba22bec SHA-1: 50a56dac85bfa666878b3f30fdcd5c7c0d2f55f7 SHA-256: d1d768b59e0742f24e9251096c5c9a4f04e33413a9258386274fed2d901a4b43
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are presented as 'hacks' or 'cheats' for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO spamming operation. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the embedded links are the primary mechanism for luring users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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/roblox-heroes-online-game-hack PDF link annotation
    • https://www.tiancom.com.tw/upload/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/kachifpro_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004815.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4815 27964 bytes
SHA-256: 35d21d85806be857c970ad880852b7dddfdcb06efd92f4b66ea2a1da55b4d4b1
font_01_sfnt_off000086e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E1 2840 bytes
SHA-256: 787e0768241fb57660bcc9c7f726cf687277c463cdf8c586c4782ee9d03c3606
font_02_sfnt_off0000909a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00009dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAC 17904 bytes
SHA-256: b7f11a2df82e7930abe2842f58c991707f2f159cab445d86aa6820b01792cbd7

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