Malicious PDF — malware analysis report

Static analysis result for SHA-256 4590408b9728204c…

MALICIOUS

PDF

33.2 KB Created: 2020-08-19 19:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cbb65ae0ab418723f1a8357de9acd72 SHA-1: d1f2f300f3402d134dcdbb2aef60ba2277618bb3 SHA-256: 4590408b9728204c0d1448a8ccbf217ee65d0caf473ebbcd01dd7f3868e2bf1b
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'. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The document body, though partially corrupted, contains the keyword 'Castello blue cheese nutrition information' and the malicious URL, indicating a lure to a potentially harmful site.

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=castello+blue+cheese+nutrition+information
    • http://ximines.learningexchanges.org/uploads/1/3/0/7/130775565/9604509.pdf
    • https://cdn.shopify.com/s/files/1/0451/8245/1861/files/35997271212.pdf
    • https://cdn.shopify.com/s/files/1/0436/1116/0739/files/vuwutagefebisirukixaxus.pdf
    • https://cdn.shopify.com/s/files/1/0437/6241/7825/files/38869623629.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/24966073829.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/kokeromiviladegesude.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/fofesafesufiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/luponib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/sklearn_classification_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/63371586963.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/46496927258.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/limijofirimukakasereja.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_off0000431f.bin
c8514f2441fd006145fc00b91e5f90efd805175a9d95c840d5f8acda8289223b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x431F 5168 bytes
font_01_sfnt_off00005479.bin
d8213b27374efac8951a48ca7dda007cd53563379484c6b2e32509715f34cab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5479 10496 bytes

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