Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d5d1da1dd355c3…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 14:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 013637f557ec16d682487cd27d089804 SHA-1: 6442733166e07a8c979fdb37b17f07841d338bb4 SHA-256: 52d5d1da1dd355c33716a70b8407e0fb9b02216877b8e0d84cc7cc4d4976bb91
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.ru. The document body, though partially corrupted, contains keywords related to epilepsy and the tool wkhtmltopdf, suggesting a lure to disguise the malicious link farm. The ML classifier also strongly indicated maliciousness.

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=epilepsia%20causas%20sintomas%20y%20tratamiento%20pdf
    • http://files.sybaritic.com/uploads/1/3/0/7/130740262/e96f7245aee7b.pdf
    • http://files.exploremynation.ca/uploads/1/3/1/4/131437117/desezimireka-fiwarepunofexup.pdf
    • http://files.catyoung.net/uploads/1/3/2/3/132302736/sirumu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/velifer.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/sipuwumidalutirimuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/bawixosunisomilowapef.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/20931567495.pdf
    • https://cdn.shopify.com/s/files/1/0429/3689/3599/files/2000_toyota_land_cruiser_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/wopalaposilupobujat.pdf
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/43387009719.pdf
    • https://cdn.shopify.com/s/files/1/0437/3273/0017/files/form_dl_44_california.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/vikizarujuwej.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7261/files/99569940429.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_off00005ca6.bin
04737fcb6fab812338b161584c8b849cda7746f1a730a29616049fbac0235c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 5360 bytes
font_01_sfnt_off00006ed6.bin
b3df828ecc64c7ffac92dfee1e3c0814aa4979db79b4271c68b245d82a891ec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 12304 bytes

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