Malicious PDF — malware analysis report

Static analysis result for SHA-256 776cf77382477079…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 05:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b495e5ca22c1d9838dc9e7c32230c485 SHA-1: cea8505d894afa6318eb5a124befa77a82dd333c SHA-256: 776cf77382477079c5eac4e862898dab14b8eedb2f5fe9a8457feb62cd45ea56
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is heavily corrupted, but the presence of numerous external PDF links suggests a link farm or redirection strategy to distribute malicious content. No scripts were extracted from this sample.

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/wix?keyword=memories+of+philippine+kitchens+pdf
    • https://static.usrfiles.com/ugd/e2b09b_c00d50d1412e42d085feb7551a970a4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec1581671e9f4cbabdd2bf6ea3278440.pdf
    • https://static.usrfiles.com/ugd/aef5b7_f688f53a4a374084bc56100be03314f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee54e5af58e14636a35fe75f85312b15.pdf
    • https://static.usrfiles.com/ugd/34ec99_901ed51766b847f08cf43938552cb6dd.pdf
    • https://cdn.shopify.com/s/files/1/0437/4842/5889/files/jidutexufikizemisesami.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/58403916424.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/guided_reading_conference_forms_for_teachers.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad0aa0217d1343d29125e7ad88f21c3b.pdf
    • https://static.usrfiles.com/ugd/6846fe_b3950b417ec04d588bd43f29e82e20ae.pdf
    • https://static.usrfiles.com/ugd/83e24f_23cedb44cba44660887580aecb495b9a.pdf
    • https://static.usrfiles.com/ugd/6a22cb_cfec9f4d321d4e439388dbb6b0529330.pdf
    • https://static.usrfiles.com/ugd/b8c837_e848af0a4e774fa497e7347473c442d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_64583559d6f14e7a8cee5f15eac648c2.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_off00006352.bin
f5527e47ed93cd354ea06a0f5c0afa3bd111cdd8ac3653f93f4e28b05b06ce8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6352 5256 bytes
font_01_sfnt_off00007517.bin
5d794181ff1a13cb4d98ffbb7a9d82982bcbaf2fba1b1204ecbda810f064261d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7517 10232 bytes

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