Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2d9c3916741066…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 21:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303d2ffdf989878b526e70ef2ccea4c6 SHA-1: 432c871a3fc44388cfdf3d1ce8cccef216e0ae16 SHA-256: 2d2d9c3916741066540ac679b92a519ad50cd1cc6734c338cac0be3b72607d52
162 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the URL 'https://ttraff.ru/wix?keyword=zarchiver+free++for+windows+8', suggesting a lure for software downloads. The presence of a 'Password-protected archive handoff' heuristic indicates that the linked content is likely intended to be an encrypted payload, further supporting the malicious intent. The document also functions as a link farm, directing users to various PDF files hosted on Shopify, one of which is the primary malicious redirector.

Heuristics 4

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=zarchiver+free++for+windows+8
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/12577852610.pdf
    • https://cdn.shopify.com/s/files/1/0440/3937/2965/files/42710415590.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/91539311733.pdf
    • https://cdn.shopify.com/s/files/1/0450/5636/0600/files/aircrack_ng_windows_tutorial.pdf
    • https://static.usrfiles.com/ugd/b8c837_b541c3dd58224a26a8f053fce03d572c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a35b832cc50148b8aeebe5931d5bafee.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/jibezun.pdf
    • https://cdn.shopify.com/s/files/1/0463/6052/7003/files/varaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/hamlet_character_analysis_essay.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/benazoju.pdf
    • https://static.usrfiles.com/ugd/314c35_5fd62873b7654a7382a481ac91988460.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0c9218a5d854a87b8ac7986e8fe816b.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_off000064c4.bin
37460c2ace45d90cbe14f178285087cfbafd6288f4f971d85460606392b50787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C4 5380 bytes
font_01_sfnt_off00007725.bin
503f8f75134c6fcdd02f42e8d6c8c2360e4e70767d999dfe48ba9ea58d51b17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7725 10340 bytes

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