Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d57eacf69844ce…

MALICIOUS

PDF

45.5 KB Created: 2021-05-15 05:30:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 067fde1ed1007d7bc9fbda4f1a57db92 SHA-1: d124e621f21aabf4f46f62a2076d9458265bb599 SHA-256: 45d57eacf69844ce65c2361bc1e985309e078911b342647c30ee584ed8289ecb
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 0.9507

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/406889139/how-to-get-coin-master-free-spins-in-email-game-hack PDF link annotation
    • http://unifieo.br/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B8E 25372 bytes
SHA-256: 16781169ee532ea22fcc59b2298be8e0f68c090a5a46fe29a412d7201c68fa21
font_01_sfnt_off00008549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8549 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFB 18384 bytes
SHA-256: bc53f1fb47f57c74fdee9351068e660e83537be046fbdaf3d8b5fad9dc1cd1bd

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