Malicious PDF — malware analysis report

Static analysis result for SHA-256 e249cfd967d154ac…

MALICIOUS

PDF

44.2 KB Created: 2021-05-18 04:52:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 296f748837e1dc88d56e21161e894270 SHA-1: cb0c479a4b2333a325390b4249a6d1379956d090 SHA-256: e249cfd967d154acf358b33ba867a9cb5e75673950f6fab1b001bd5d538b65ef
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 0.9648

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/coin-master-free-spin-and-coins-links-game-hack PDF link annotation
    • http://unifieo.br/images/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-coins-hack_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-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/rbx-place-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/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-coin-master-cards_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_off000044d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44D0 25088 bytes
SHA-256: 3a72772e2b8c12fe0d1dfa573ff734a3d0b1f1785a87b71a7ea06fe3a6769252
font_01_sfnt_off00007ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A19 18228 bytes
SHA-256: ab1c4cdc214a6baf81a15e2f62a40ea9cfbbbf407f0f3dd1c7564e467cf0dae2

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