Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a08200b79d79e56…

MALICIOUS

PDF

48.2 KB Created: 2020-08-11 06:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aaf4b573bbe995f4d1ee0aae79d4635 SHA-1: 0c9300a845d39bd225c3641c279619f700cec016 SHA-256: 2a08200b79d79e566b36ce440c9116c199321e1cd8ce39ca76686e2b577d504b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link to 'ttraff.ru' and a large number of external links, indicating a link farm designed to distribute malicious content. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent.

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/pify?keyword=corel+cdr+to+pdf
    • http://files.ohsoretrovintage.co.uk/uploads/1/3/1/3/131382226/5638619.pdf
    • http://madon.sjdmortgage.com/uploads/1/3/2/6/132681352/biruwevurunefov_vasufa.pdf
    • http://tabibepo.annasounds.com/uploads/1/3/1/3/131383651/7405561.pdf
    • http://files.covertsrustproofing.net/uploads/1/3/2/6/132681823/6772462.pdf
    • https://cdn.shopify.com/s/files/1/0432/7102/8896/files/69474560289.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/1558281670.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/4038537545.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/62978287586.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/zujekazudubokiru.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5517/files/anarchism_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/mathematics_grade_10_12.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/84958183393.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/faganikatitose.pdf
    • https://cdn.shopify.com/s/files/1/0440/8701/7637/files/basics_of_c_programming_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/50700909321.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ff.bin
56fe2e38df458e63f8e5eb549798746d1a4d12b6a733e3201319dc1dbadfac26
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FF 4664 bytes
font_01_sfnt_off000074ea.bin
46efbfe3e3bb4745bde593b690167fc42ed76a8b9bff2cf6acd35f26baff0a88
pdf-font-stream PDF embedded font (sfnt) at offset 0x74EA 13112 bytes
font_02_sfnt_off00009f4a.bin
f283a563ee48c68d0f210b91d059b93f2da97875a4894e08c15e1f8ed5b97a7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4A 16076 bytes