Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c235b6b2609d801…

MALICIOUS

PDF

43.3 KB Created: 2020-08-14 11:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcb2999dae49639fa32f6937235936b5 SHA-1: 7d9f844791deaaceb685057e4ddf660d46d13e4c SHA-256: 4c235b6b2609d80107ff65a58ac837da74ff9a5d6f03d33a27bd2275d7f0e7a8
150 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one URL identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'economic integration in europe'. 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/wb?keyword=economic%20integration%20in%20europe%20pdf
    • http://files.mrdbc.com.au/uploads/1/3/1/8/131872032/876094.pdf
    • http://files.cienaraenelson.com/uploads/1/3/0/7/130739786/3285604.pdf
    • http://files.hulseenkelinrottweilers.com/uploads/1/3/0/8/130813921/derusezix_nevifusi_lexona.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/cara_buat_resume_di.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/45843384846.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/troybilt_horse_tiller_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7424/7069/files/31558116721.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/50738525477.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/atmospheric_layers_of_earth.pdf
    • https://cdn.shopify.com/s/files/1/0433/9843/0876/files/deep_learning_yoshua_bengio.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8102/files/exploring_psychology_9th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3507/files/27486231254.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6573/files/8843191629.pdf
    • https://cdn.shopify.com/s/files/1/0443/2376/6428/files/britannica_learning_library.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/tizepu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/gst_full_information_in_marathi.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_off00005ed6.bin
3c4915d902eb11d5819ffe2093b770edc64c7b81605e4dfec28be0963e163ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 5104 bytes
font_01_sfnt_off00007009.bin
3cc0f884e8e903dea66ce6d296315b58ebcab24ac512ebbec30423196b31d012
pdf-font-stream PDF embedded font (sfnt) at offset 0x7009 10056 bytes
font_02_sfnt_off0000925e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x925E 4324 bytes