Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7c04c97e28b8ac…

MALICIOUS

PDF

43.3 KB Created: 2021-05-13 01:02:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a37a63aa37bbb704ced2bddd28a05607 SHA-1: 1e0fa4e6b8d022c7e0170573613e60a07fe0d5e5 SHA-256: 5c7c04c97e28b8acade17ed287cd8f58d7bfd90076fcf7e56f34205851cb58f5
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/win-free-robux-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/corn-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/robux-free-2021_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
stream_003_off0000487d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487D 26572 bytes
SHA-256: 1f670d0cea25804e664386db02ca1b572d6b3b3f4a372260d9d6aacde79e21c1
font_01_sfnt_off000086d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D1 18332 bytes
SHA-256: abf0b8ed31f5047ebf3c1463738251345f2a3e8ea43e3f17fb5c5b26bb0b5a7e

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