Malicious PDF — malware analysis report

Static analysis result for SHA-256 43883e0a2a2ae32e…

MALICIOUS

PDF

62.3 KB Created: 2020-09-01 08:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 754923b4a6d82e4cfd27661477fd3888 SHA-1: 110f3b406126cef7be553e77b0e6dede9fcec292 SHA-256: 43883e0a2a2ae32ea5d83f4ba11bcb27a3218448e13f8c24dcd10cf0c7d42ea4
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is likely used to deliver further malicious content. The document body, though heavily obfuscated, contains the same URL and keywords related to Excel date formatting, suggesting a social engineering lure. The presence of multiple embedded links to external PDFs, many hosted on static.usrfiles.com, indicates a link farm strategy, likely to improve search engine ranking and distribute the malicious payload.

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=vba+excel+date+format+dd%252F+mm%252F+yyyy
    • https://static.usrfiles.com/ugd/a91264_ae460774cb2846698781fbb35dc0655b.pdf
    • https://static.usrfiles.com/ugd/edb4a7_405d534ada8a4d7e8a00686d4131a076.pdf
    • https://static.usrfiles.com/ugd/af0aa9_d4f7639b61c04ceeba4fef46d16c1d69.pdf
    • https://static.usrfiles.com/ugd/cc10e7_1b3f03841dbc4315827132563bc46303.pdf
    • https://static.usrfiles.com/ugd/f4de5e_3470cda4f3da49b7a49bb2d21897f1c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f31e5b92342443bbf0fd6b95516c983.pdf
    • https://static.usrfiles.com/ugd/3f80ec_eea7d52bb20a4fc489646d830495daa1.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/calisthenics_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/2255794578.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/88329495128.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6202/files/70978347825.pdf
    • https://static.usrfiles.com/ugd/6cfc61_3942835263024ffaa788a89b9558dc56.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1ed68ff68d54656877f64cb1e053e6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bf50ae1afd24b6fb38718fd7279e402.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_off0000b6c5.bin
6f4a74fc6d2844e731e0427951132a122f1d4142edd8eb1010442a47b47baee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C5 5300 bytes
font_01_sfnt_off0000c8d0.bin
3cb49cec150a3f0ca9f8e840cc29141a37cdd99692be7cbdd537b39ae7908c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 10308 bytes

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