Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4af37fdc847fa6…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 02:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5725871268c4dc302c36122a3ace2e0 SHA-1: 81a2641214eb2fa288e0762392f1bc68834fd588 SHA-256: 7f4af37fdc847fa60c7d779446af92a199bb8b521e4faa93d4795f12d8696685
150 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 primary malicious URL identified is 'https://ttraff.ru/pify?keyword=antigona+lektira+pdf', which is likely used to redirect users to malicious content. The document body contains garbled text but also includes the malicious URL and several other URLs pointing to Shopify, suggesting an attempt to disguise malicious links among seemingly legitimate ones. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=antigona+lektira+pdf
    • http://files.joekieferart.com/uploads/1/3/2/8/132815791/nakiv.pdf
    • http://files.mosaicfamilyinc.com/uploads/1/3/0/8/130873942/dixasesevex_xuvina.pdf
    • http://files.ndt-resources.com/uploads/1/3/1/3/131379730/a91ae5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0439/6548/1118/files/el_aprendiz_de_brujo_1_pnl.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/40765261694.pdf
    • https://cdn.shopify.com/s/files/1/0447/0204/0217/files/cidco_lottery_result_taloja.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/monitoring_and_evaluation_tools_and_frameworks.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/diccionario_biblico_unger_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/kutejawujidunukuxezat.pdf
    • https://cdn.shopify.com/s/files/1/0430/0986/7929/files/85764222353.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/52174396156.pdf
    • https://cdn.shopify.com/s/files/1/0435/9127/0563/files/49096307936.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/96382461576.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/45278745543.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/xewunikesozow.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_off00006896.bin
9bf901b04f0bc2fdf4d800685af6fa6724cf3f3e3ea3b85e1ad8e5d6e5d85424
pdf-font-stream PDF embedded font (sfnt) at offset 0x6896 5084 bytes
font_01_sfnt_off000079f1.bin
7c7b7e54f6a0377cfc472820c4ea3c11af3bf93e8f2818d45b59a634d04b5704
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F1 9780 bytes