Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb837855bb9e066…

MALICIOUS

PDF

45.4 KB Created: 2020-08-06 04:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b7ee089e35614674c4284deb7d30ef SHA-1: 33ccb291eeeba9c3efff12857627015fd63889ae SHA-256: efb837855bb9e066246ea2cd8db19a465836298c4238af9b32d8f87b98448e2f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=surgical+treatment+of+cataract+pdf', suggesting a lure to a malicious site disguised as a medical document. The presence of multiple PDF links and a malicious redirector indicates a link farm or redirection-based attack. 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/pify?keyword=surgical+treatment+of+cataract+pdf
    • http://files.nationalathletic.net/uploads/1/3/1/3/131383771/fanibuzariju.pdf
    • http://files.visionsworkshops.net/uploads/1/3/1/4/131453855/c515dd3407f9.pdf
    • http://files.balikowskidentallab.com/uploads/1/3/0/7/130739528/3a1023fb243b5.pdf
    • http://files.cobusinessadvisors.com/uploads/1/3/2/8/132816096/5578153.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/95118350170.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/c_node_class.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/gefopulepeledu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/93325858062.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/44583228764.pdf
    • https://cdn.shopify.com/s/files/1/0432/6640/8603/files/36954033464.pdf
    • https://cdn.shopify.com/s/files/1/0435/6613/7507/files/com_facebook_appmanager.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/campbell_and_reece_biology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/43345587141.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/wixenasunagodepena.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/tebuduniv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5908/files/central_african_republic_conflict.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/arithmetic_and_geometric_sequences_and_series_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006612.bin
0336b2023b62f7c5a33b3dab04c58f78e5fe2c17bc2943f6f336c946d0e9ac29
pdf-font-stream PDF embedded font (sfnt) at offset 0x6612 5284 bytes
font_01_sfnt_off000077e5.bin
88de2384605fb9dc931f27b3123116fdbc2407b46a4bdd594c6cb46655c4fa68
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E5 10036 bytes
font_02_sfnt_off00009a4e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4E 4324 bytes