Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c5d56afa806f01…

MALICIOUS

PDF

35.3 KB Created: 2021-06-20 13:21:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 654d4501178171cce2ec1471dee12fe4 SHA-1: 778aac6a2e51649ecac6b15ed2bc40d56fe94938 SHA-256: a2c5d56afa806f01b12ee8212510af85da017726554cfec6174c390e3020c839
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized and point to sites offering 'free Robux' or 'free spins', indicating a lure for potentially malicious downloads or scams. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm heuristic further supports this assessment. No scripts were extracted, but the overall structure suggests a phishing or scam attempt.

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.co/app/431946152/free-robux-no-human-verification-2021-or-survey-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-any-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-a-hacked-account-back-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/a-free-and-fast-way-of-getting-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-street-simulator-money-cheat_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/my-account-has-been-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/best-free-game-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-hacks-and-cheats_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_off000030f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F0 22092 bytes
SHA-256: 8ca5eec24e7a910ef109eb869dbeb4b5202e23dfc22927256a2cb827ab5c310a
font_01_sfnt_off00006202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6202 20028 bytes
SHA-256: 0f6b43ae9e65d7a80009945f739e437c192855e977f33187dcbeb8854b1faeec

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