Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef0dbeca1de9a87…

MALICIOUS

PDF

37.0 KB Created: 2020-08-29 19:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3772bbbcbcc5713f39965e148cba6e5e SHA-1: 94144d20801dc0714ce76173a585c04b857693d7 SHA-256: bef0dbeca1de9a87b0f39d3065dc56852346de64df599cc21df054fd0341bb3c
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily garbled, contains the URL that triggered the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting a lure to a potentially harmful site. The presence of a large number of external links also points to SEO manipulation tactics.

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/wix?keyword=tarihi+%25C3%25A7evre+koruma+ve+restorasyon+zeynep+ahunbay
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/english_telugu_english_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5911/6182/files/51357713029.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/how_to_make_a_corner_bookmark.pdf
    • https://cdn.shopify.com/s/files/1/0470/9056/5278/files/35042954140.pdf
    • https://cdn.shopify.com/s/files/1/0437/0399/2485/files/bhangra_gidha_song_djjohal.pdf
    • https://static.usrfiles.com/ugd/b8c837_f25029c95b1444699c610ca0f4363698.pdf
    • https://static.usrfiles.com/ugd/cc10e7_5d2ceeb92e014dee8d6684e35bbc5cae.pdf
    • https://static.usrfiles.com/ugd/e2c250_13f971172bb54243adee1b1819bef8d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed6b4b5cd7af4c21a6159f72421b3196.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_33a0459c744b4a608b424a2a357926e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ebb2b9cc4f49bcb732a2ef894610f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_439cb3377941494f903a4dad124ae329.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ceb78c68bbf485ea5bca3884f740ab8.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_off00004daf.bin
ac77af84eeeea82c36a3f1cce46b13f3d06067f5cb0e7043a8028d6308ada576
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAF 5576 bytes
font_01_sfnt_off0000608e.bin
8ea6d9411fff900799e937cea40e4d61c917f9d04b0ca7080e37c127460d354c
pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 11624 bytes