Malicious PDF — malware analysis report

Static analysis result for SHA-256 554c429c54051561…

MALICIOUS

PDF

41.7 KB Created: 2021-05-20 02:43:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8ec4c54765d9b24a13bdf25004d943db SHA-1: c24f4990bec0cbd403976bbda857a87632536a65 SHA-256: 554c429c54051561e7c0cd5abca7f73d723048c83fc2680d746be0f9dbb26775
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external websites. These links are likely intended to redirect users to pages offering free spins for games like Coin Master or Robux, serving as a lure. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent, and the presence of external URIs suggests a potential for downloading further payloads or engaging in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-spins-link-today-game-hack PDF link annotation
    • http://www.eptaviation.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://www.eptaviation.com/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/freespincoin-masterlinkdownload_GM406889139.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
stream_003_off00004890.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4890 24280 bytes
SHA-256: fa3ff8cb2c41da415aca37374ec2a21297f6b13b1d535640f65ac476d657f5ae
font_01_sfnt_off00007ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 18412 bytes
SHA-256: ee277532c3187caf3da016130e4cbd3fee848ac0b1174d0f40fc16c12ed3c41d

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