Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5bf041ee81a156…

MALICIOUS

PDF

44.0 KB Created: 2020-08-11 23:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a4ebe6b81e0a9a94e0bdd60d62a816 SHA-1: 0b8687b07ce05cc9db7a08f3fdc7a479a0ab30cb SHA-256: ca5bf041ee81a156ccb188b348661834c7da477b72c4b91fe529d33a3b463169
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Dompdf autoload. inc. php missing' and includes the malicious URL. This suggests the document is designed to trick users into clicking the link, leading them to a malicious site. The presence of many Shopify-hosted PDF links, while mostly benign, serves to camouflage the malicious redirector.

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.ru/pify?keyword=dompdf+autoload.+inc.+php+missing
    • http://jokom.karraschconsulting.com/uploads/1/3/0/7/130740072/2523507.pdf
    • http://vemotu.pennlawlambda.com/uploads/1/3/2/7/132712615/dasazorena-wuvolaxoxa-zedewerore-nabem.pdf
    • http://pexolaxa.historiaflorals.com/uploads/1/3/0/8/130814328/pigerepeta_totoxamuzugutap_sebeliboxupa_wuridififema.pdf
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/el_zorro_astuto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lovukapovilelogitolosir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/59554831347.pdf
    • https://cdn.shopify.com/s/files/1/0445/4537/6420/files/convert._ai_to_png.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/juremepuzipak.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/juki_sewing_machine_parts_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/sufugit.pdf
    • https://cdn.shopify.com/s/files/1/0437/7460/7514/files/jurnal_skripsi_akuntansi_perpajakan.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/python_caesar_cipher_decoder.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zosogorimojafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1930/files/mesezakesinesogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7874/6261/files/somuwidepojikejime.pdf
    • https://cdn.shopify.com/s/files/1/0433/6291/0376/files/jepozowotoliwexegamur.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/xobesejajoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/rerivatafevasagewuxuxivuw.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_off000065e7.bin
fd3d0f327684abcf3cc95869fe394894fcbd9e1daf8eed3ba326e1a6cec72786
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E7 5504 bytes
font_01_sfnt_off00007880.bin
0a233c6f8c566ade9b1dc1b066484ad429903229a74cd89c692f79f632c1c040
pdf-font-stream PDF embedded font (sfnt) at offset 0x7880 13064 bytes