Malicious PDF — malware analysis report

Static analysis result for SHA-256 b838628678acfcd0…

MALICIOUS

PDF

45.1 KB Created: 2020-08-29 21:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78203c50e1f03d3cfa9a3580c079b973 SHA-1: 193f05e79cc2565b4a2c8dd0233e296b5c5e851d SHA-256: b838628678acfcd07f23e34264cba38c3c6c23c0ae66577fcfeb38742864fc48
120 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 a critical heuristic firing for a PDF link farm. One of the primary links directs to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains references to academic topics and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The presence of numerous links, including one to a potentially benign-looking Shopify URL, indicates an attempt to mask malicious activity within a large volume of seemingly legitimate content.

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=el+estado+y+sus+elementos+derecho+constitucional
    • https://cdn.shopify.com/s/files/1/0437/6523/5866/files/habitats_of_animals_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/53098067838.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/fugabomabaxu.pdf
    • https://static.usrfiles.com/ugd/b8c837_0444f4670e5641759cd886d5c46e78c8.pdf
    • https://static.usrfiles.com/ugd/269bb8_4d05bc3d163c4690957376cc5a1e67a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdc032211353441aaf2642c7d3f9f21f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e675a2250c904eb7b62ac519e0869a72.pdf
    • https://static.usrfiles.com/ugd/b8c837_b990027b51764463bd2c0b63f04a42d4.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9109/files/public_finance_economics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2916/files/munisasoboxasibalopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/30992309679.pdf
    • https://cdn.shopify.com/s/files/1/0438/8572/3816/files/andis_official_blade_guide.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_off00007036.bin
6edb7a34064b4e0e3327ecdb004f30be3696c222083be908a51959189985b3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7036 5236 bytes
font_01_sfnt_off000081d6.bin
c8f61c503274203bac38c9b5667e0a2afff38c9bd158ad83701b13a8c5dcb3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D6 11116 bytes

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