Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1cef597d2adc59…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 12:41:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f98765249061f57ce90a4e736e0b30f SHA-1: e227409c8ffceb1ee314e3bb2a664c6493a40b03 SHA-256: 1e1cef597d2adc5922b3237521ef6c6b7e50e91a802211eb571befa18cfb2444
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm heuristic suggests it is designed to redirect users to external sites, likely for malicious purposes such as downloading malware or engaging in scams. The ML classifier strongly flagged this PDF as malicious, and the presence of download-related phrases further supports a malicious intent. The document's content and structure indicate a lure for game-related cheats or currency, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/roblox-re-game-hack PDF link annotation
    • http://www.nfca.org.tw/upload/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/bloxfree-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-fre-fsp_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/gat-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-age-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-for-mobile-24-com-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-roblox-accounts-on-pc_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/como-ser-hacker-en-roblox-jailbreak-2021-mayo_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-2021-download_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-someones-roblox-account-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA9 22104 bytes
SHA-256: 6197beceaa5c806fd728fa81b03326dbd295a9f5a0b7645eb77376bcdcf44ff7
font_01_sfnt_off00006072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6072 18484 bytes
SHA-256: 9f3d5f952a5a8565a36a95a9616e220af72e779ac4925ec2f8c0411011cafdf3

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