Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af204f61febd728…

MALICIOUS

PDF

42.4 KB Created: 2020-09-10 00:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c465e3438e8a9838195b61060478bda SHA-1: 6054f59d9bc18bb7f413b898494f66a6fc99b927 SHA-256: 0af204f61febd728b178e6b27c2cc978de45d98e79b976e59a8f5e75b249581d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links, https://ttraff.me/wix?keyword=havaianas+sizing+guide+uk, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL and other PDF links, suggesting an attempt to drive traffic to malicious infrastructure.

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.me/wix?keyword=havaianas+sizing+guide+uk
    • http://files.rockthecradlemusic.com/uploads/1/3/0/7/130739116/3288130.pdf
    • http://files.krabi.fi/uploads/1/3/1/8/131856949/ef3be8bd7c3f.pdf
    • http://sunizawot.royalvacationtravel.com/uploads/1/3/1/6/131637814/xibevosu.pdf
    • http://files.autismeducatorsact.org/uploads/1/3/2/6/132681783/b629bf27200553e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/289c5e_e43a6c1b5ce647ccb29e9ffd0676d12f.pdf
    • https://static.usrfiles.com/ugd/5b604d_8d17795859744ad2bf2c521c17c4c8fb.pdf
    • https://static.usrfiles.com/ugd/544e7e_ef776ed72e2249f7a863fe6697d8e397.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8992/files/center_parcs_elveden_forest_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/46209801755.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/buku_agama_islam_kelas_11_semester_2.pdf
    • https://static.usrfiles.com/ugd/5ea691_ead5c396bdf249ab88689d86e059a9e5.pdf
    • https://static.usrfiles.com/ugd/338562_7d45bf85f7f144c5897052e8985b12cd.pdf
    • https://static.usrfiles.com/ugd/834936_072c90f1e4b94e34ab48f72a76dd4fa5.pdf
    • https://static.usrfiles.com/ugd/e3c460_43e28661806c4b00baa0a5d01a096f90.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062cd.bin
969ba3b9c93c216cdf653a94b7f845966d09d93291d3eef52efe1e51c6345ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x62CD 5000 bytes
font_01_sfnt_off000073f4.bin
d911cdba576e79e577ac368b8bd26ebd184f6d40e50ac56f4146b5dfdb68362e
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 12996 bytes