Malicious PDF — malware analysis report

Static analysis result for SHA-256 57360535d366537c…

MALICIOUS

PDF

41.4 KB Created: 2020-09-08 11:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8f29e7bfd65b5480823521290ccfaa1 SHA-1: e5e0e51bbda4bdf6fd371d9dd79088c99c278966 SHA-256: 57360535d366537cc33c0d02f982b54949b4be7364d6adc829f99381451db8c1
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many of which point to external PDF files. One of the primary links, 'https://ttraff.ru/wix?keyword=cricut+writing+font', is identified as a malicious redirector. The document body contains garbled text but includes this URL and other PDF links, suggesting a link farm or redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=cricut+writing+font
    • https://static.usrfiles.com/ugd/121e37_4f6cc0dc8c0f412c8aa015278a5a9a45.pdf
    • https://static.usrfiles.com/ugd/ace02d_1d8dbca3f6b94730b3b84de7916f25b6.pdf
    • https://static.usrfiles.com/ugd/3f4b99_98a8d16ae0fa4b22a78306688c49033f.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/39154678774.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/29155800522.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/51635752785.pdf
    • https://cdn.shopify.com/s/files/1/0466/3400/8741/files/sean_cody_billy.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/nevafejulokipavinul.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/janodalofekagesaxug.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/damejaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9606/files/autobiography_of_a_yogi_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/nenuxomasaduxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/26665673374.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/kewadulapoli.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_off000066b2.bin
0220ea2de941f7816392869ac8ff8b241ebf7ac2b803aa67c70f61264f0aa16d
pdf-font-stream PDF embedded font (sfnt) at offset 0x66B2 4628 bytes
font_01_sfnt_off0000769a.bin
c5e25228457fe1ea56ae5e88fe3815f61749c7d7f5ace251c0aa6aff21f788ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x769A 10060 bytes