Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b5199eb2d4fbb1…

MALICIOUS

PDF

68.9 KB Created: 2020-08-16 19:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8213565016a5649f4a05fb7e6796b62 SHA-1: ed7fe10bde3c724fabb4f7925fa314da61348511 SHA-256: 26b5199eb2d4fbb15d53b6475dabe5641c3076a8b32d6ce37e588f93a1e51708
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristic. This suggests the primary purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.ru/pify?keyword=amanda+palmer+judy+blume+sheet+music
    • http://files.wcbk.com/uploads/1/3/0/7/130776726/4433218.pdf
    • http://files.cardiffnailsandbeauty.com/uploads/1/3/1/8/131856134/dilivoxi.pdf
    • http://files.supportiveconceptionssurrogacy.com/uploads/1/3/1/3/131379290/e38381d.pdf
    • http://files.dassiedahan-author.com/uploads/1/3/1/4/131436971/wixodasa.pdf
    • http://files.artbookhabit.com/uploads/1/3/0/7/130775677/9142798.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/xefuta.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/nakadapupetikewuva.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1998/files/advanced_excel_course_material.pdf
    • https://cdn.shopify.com/s/files/1/0439/3231/9899/files/ruby_require_relative_all_files_in_a_directory.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/new_amplified_bible.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/ambulance_man_badge_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/where_to_find_googlechrome._dmg.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/jugigofebaner.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6600/files/xivigelogowibel.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_off0000c5b7.bin
db30a1baac85a63054620618c4e3eb4c07af7005cc6f6d82c9a3a7462ea22bbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B7 5620 bytes
font_01_sfnt_off0000d897.bin
ee6cdb3340e159fd42caba7fc9f25cf8140de67cfb0d48768be600b2fcf82f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 14836 bytes