Malicious PDF — malware analysis report

Static analysis result for SHA-256 299ba1822f0775f6…

MALICIOUS

PDF

35.9 KB Created: 2020-08-31 02:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 798c29e9431db6d1aa1967792a4a410c SHA-1: 5a49bbc59c8f90f836c2a4f7a585b0158d162bef SHA-256: 299ba1822f0775f6af4c8212498a1ae0d740e7c9b1785b9ddb27ecfa786ca99c
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=languages+by+carl+sandburg'. It also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDF documents hosted on Shopify and static.usrfiles.com. The document body is heavily obfuscated but contains the same malicious URL and several benign-looking PDF links. The primary attack vector appears to be social engineering through deceptive links within the PDF.

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=languages+by+carl+sandburg
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/89683231491.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/38768338467.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0741/files/letter_for_internship_request.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_b65dfe82db1c46baaf43eb455fc3e8d2.pdf
    • https://static.usrfiles.com/ugd/61804c_62d8c6b3fe134afd9a985af6c591022b.pdf
    • https://static.usrfiles.com/ugd/c0b427_21365966df654fbb87391f3e5572073c.pdf
    • https://static.usrfiles.com/ugd/e33828_49efd7a2eaa84d1c9e31d37abb7af39d.pdf
    • https://static.usrfiles.com/ugd/65b209_d61de1331f6a4dcfafa5db713bc0f364.pdf
    • https://static.usrfiles.com/ugd/a2e20a_fa7825d0f3ce4ccbacef921e94a4a1eb.pdf
    • https://static.usrfiles.com/ugd/850f07_41db54fe958442fbb0374587ac9ceb11.pdf
    • https://static.usrfiles.com/ugd/b8c837_4653aad5158948bca635b0a5e4627b5e.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_off00005156.bin
a77198ae801da5d3004517763dd16737516ed65e570f7865263d0f997e649f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5156 5288 bytes
font_01_sfnt_off0000635c.bin
f85aa488350b8ada86f9ea31101d0a93553f1707f7ff3f895e460a200b51e5af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 9380 bytes

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