Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c19bd23ed39de4…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 14:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0667c3607f3eb98d5a3d828347c199c4 SHA-1: eeb26be6bc7725acb78d9471610dbe3cfe84d2ab SHA-256: 90c19bd23ed39de45729049090324ca5daf4829ee118200b5514ac37b536cec9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as 'frindle vocabulary activities'. This link, https://ttraff.ru/wix?keyword=frindle+vocabulary+activities, is designed to lead users to malicious infrastructure. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a 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/wix?keyword=frindle+vocabulary+activities
    • https://static.usrfiles.com/ugd/b8c837_735c6288f6dc435e9ebd8326560b260d.pdf
    • https://static.usrfiles.com/ugd/10e3af_f6e62e52029c463daa57f50b4c676121.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3faba924c5144b0899bbc2da6b149b6.pdf
    • https://static.usrfiles.com/ugd/12f4eb_b3587f4450dc490c884729a2af992317.pdf
    • https://static.usrfiles.com/ugd/b8c837_b62ce61e7b49492f9187ab3132f7c316.pdf
    • https://static.usrfiles.com/ugd/b8c837_0425a56518024801944dc1c0f3b7465b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f6098a780084613aac26b7d57425968.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/34030181774.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/event_planning_business_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/kayla_itsines_bbg_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/43557466471.pdf
    • https://static.usrfiles.com/ugd/b8c837_b823b192ac544501a3976a979847803b.pdf
    • https://static.usrfiles.com/ugd/b8c837_79db1b3cedb34562867ac8531568f8aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc8001a335954c0597ff760a643b0b0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ffa41a2f0a4ea58ef08650f38e5c37.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_off00006600.bin
dfb487ea903fcd188038df9d85ce05f1de817d254f0cd35cfc7b83313c5e3ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6600 5188 bytes
font_01_sfnt_off000077b1.bin
f0c6126f67858f760ced16edad697f4b1e14fb9410d1854d116858d9ae7a39cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B1 10544 bytes

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