Malicious PDF — malware analysis report

Static analysis result for SHA-256 237307d7d74db396…

MALICIOUS

PDF

38.8 KB Created: 2020-08-14 01:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afa087694aff47608138457f5186b530 SHA-1: edca9143f74fc13e21afb9910adcd99ab114628b SHA-256: 237307d7d74db3963bf3299f43874e72ecde9e7aff42184950f2bb31ce00761c
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.ru/wb?keyword=solar%20vs%20sidereal%20day%20worksheet%20answers. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious content. No scripts were extracted, limiting the analysis of further execution chains.

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/wb?keyword=solar%20vs%20sidereal%20day%20worksheet%20answers
    • http://xowetogu.noyzelab.com/uploads/1/3/1/6/131606407/xixaxekekazugu.pdf
    • http://files.lakesideschnauzers.com/uploads/1/3/0/8/130874304/2996326.pdf
    • http://files.beechercityilevents.org/uploads/1/3/0/8/130873708/didik.pdf
    • http://files.georgetownenvironmentalhistory.org/uploads/1/3/0/7/130775402/wewuvupezukom-towemigelikufam-wupagasoner-wugavawim.pdf
    • http://files.christiandewulf.com/uploads/1/3/2/3/132302939/b89230.pdf
    • https://cdn.shopify.com/s/files/1/0434/9168/8610/files/tebuwejosivelutujisabiril.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4417/files/vcf_file_to_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/65562040097.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/92843177936.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/goxoxemeduzipukujiwife.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/davovovexajujikotaxosif.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/anemia_ferropenica_microcitica_hipocromica.pdf
    • https://cdn.shopify.com/s/files/1/0449/8512/2984/files/san_bernardino_county_pcor.pdf
    • https://cdn.shopify.com/s/files/1/0437/1909/8523/files/oxford_bookworms_robinson_crusoe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/zonivi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8107/1782/files/tisobimudoxamuxel.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_off00005a5f.bin
86f6362d60d9552d10bcae489766c6759497a557f30c0dad71297ecbb24f5933
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5F 5336 bytes
font_01_sfnt_off00006c8c.bin
f76b2f5b645e273af4bec3df1c1d137c3ad3a5d64464dac3a5916d6db216b63d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 9816 bytes