Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf0cc6d69ff5ed3…

MALICIOUS

PDF

31.0 KB Created: 2021-06-30 05:23:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a385506d5c5dfe6f5442a68d1a9b4176 SHA-1: b0ecb42a58f23175ee4084e2211e5bad438d1039 SHA-256: 5cf0cc6d69ff5ed3f046ca68d933a18bc9a9a45532109521c5036f13bae45271
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • 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.
  • 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-roblox-card-codes-2021-not-used-game-hack PDF link annotation
    • http://elib.upiyptk.ac.id/opac/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pokemon-go-free-online-game_GM1094591345.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/pokemon-go-kanto-tour-free-version_GM1094591345.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/hidden-immunity-idol-survivor-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/best-payed-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/ww-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33BF 22120 bytes
SHA-256: 91d9930bea3239bcd8cc94ff54d44807e487d49006a6d0e0b141af5778d96480

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