Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c232fdad8e9dad…

MALICIOUS

PDF

55.5 KB Created: 2020-08-25 08:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6f022ca81228bd37c27008827f46dc9 SHA-1: 7bc5717608e24ad725f9d47dcf68bd1b0e3500fa SHA-256: b6c232fdad8e9dad58e3cc474806386116ecfe886ced792ece61667e2a7efa08
150 Risk Score

Malware Insights

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

The PDF file contains a prominent link disguised as a search result for specific content, which redirects to a malicious URL. This indicates a social engineering tactic to trick users into visiting a potentially harmful site. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector link and part of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.com/pify?keyword=realidades+2+capitulo+1b+answers+page+18
    • http://vepaxuf.rjupmarketpress.com/uploads/1/3/1/6/131637881/69ac8c416b6951f.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/libro_azul_de_arquitectura_sostenible.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/93819852267.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/10396665009.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/lse_reading_list_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3097/7434/files/75527852425.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/need_for_speed_most_wanted_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/maravadazubelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/bp_recording_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/apuntes_sobre_defensa_nacional.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/70829418120.pdf
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/jupox.pdf
    • https://cdn.shopify.com/s/files/1/0437/9276/0994/files/golemaxufotinovopefuwewev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099d6.bin
162410540e05500ad0e08578004ca20d6bcc4315a356deaf4b7688ca9719330b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D6 5856 bytes
font_01_sfnt_off0000ade0.bin
38390518db9dfdc3aecb902de0b263fd0084724b782590bf6548444066ea2c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE0 10408 bytes

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