Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc39a30c3420c2c2…

MALICIOUS

PDF

39.0 KB Created: 2020-08-31 06:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1619843cad63cb8ed6360e209494825a SHA-1: d194c54f6fabb3264ca13489923ec118a2028896 SHA-256: fc39a30c3420c2c2cc64a91bc046172d3b42d7d4f4a10b002964ef8d75efb1dd
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.com/wix?keyword=Honig+Senf+Schweinekotelett+marinade, is flagged as a known malicious redirector. This suggests the document is part of a campaign to lure users to malicious websites through a series of redirects.

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.com/wix?keyword=Honig+Senf+Schweinekotelett+marinade
    • https://static.usrfiles.com/ugd/76156b_c9e1e324360f441e91b1570c46347141.pdf
    • https://static.usrfiles.com/ugd/6f53d7_57836312de704fbdb64e3e4f36146b5b.pdf
    • https://static.usrfiles.com/ugd/e643da_6a280d62d8714e8f956ae6242214a398.pdf
    • https://static.usrfiles.com/ugd/dd4472_a50acb4f47c74e23b82f7c3e4acdb1eb.pdf
    • https://static.usrfiles.com/ugd/e2c250_8e918687ec144051a2bcfdc0ca75c066.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_29902046335e42cf9d937507a80ed7e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6e67f3ef8974a8db3e9e548c42f63bc.pdf
    • https://static.usrfiles.com/ugd/804ff6_42b6c62c35d94c76852f4b33b76c6b2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d59396c198f4cf39d4cf8d6817daf74.pdf
    • https://static.usrfiles.com/ugd/5899d5_5feb7635a7da45e8a0715c15eb0f0fe4.pdf
    • https://static.usrfiles.com/ugd/affb4a_09fc24c95b774c16bc787b3c8fdd4f7e.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/weririsubok.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5718/files/dilibudugukaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/fubopizonirosalelex.pdf
    • https://cdn.shopify.com/s/files/1/0440/6493/1992/files/xopalikolodoredefaki.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_off00004a5e.bin
8c1f99d1b67d1460d428faa0b703e97472217e90d763ce199585669276636a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A5E 5360 bytes
font_01_sfnt_off00005c78.bin
f39f95e9571888b6db907c61922fde871c7533d95bed144b2e7a5af28d42d6d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C78 10684 bytes
font_02_sfnt_off00007f4b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4B 4324 bytes