Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b76cfa2abb8198…

MALICIOUS

PDF

52.0 KB Created: 2020-09-01 08:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a17f9606fdd455c0ca25400712e4895d SHA-1: e4936193145d0099fc7fe3c7a6acd5b7c9674c72 SHA-256: f8b76cfa2abb819899544195f7d3222825a25f63c027bf7a67699e53a7a21d89
150 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a legitimate app download. The primary heuristic indicates a PDF link to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. The file also contains a large number of external PDF links, many pointing to Shopify, which is characteristic of SEO link farm tactics used to improve search engine ranking for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/wix?keyword=pdf+annotate+app+ios
    • https://static.usrfiles.com/ugd/8ba634_df1f91dc37d14471beaafb3f86059f63.pdf
    • https://static.usrfiles.com/ugd/f65518_995c4afb5e1e43f78b4ab63020ae64be.pdf
    • https://static.usrfiles.com/ugd/01bc73_5ca49ea4dccc4f9a8750b76ce411dc86.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/dry_cleaning_brochure_templates.pdf
    • https://cdn.shopify.com/s/files/1/0438/4499/3181/files/venture_capital_private_equity_a_casebook.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/fuzuvipelijevitugofovite.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/41862096941.pdf
    • https://cdn.shopify.com/s/files/1/0456/9146/9983/files/filmywap_2017_movies.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/beating_bronchiectasis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/67830048110.pdf
    • https://static.usrfiles.com/ugd/5a1791_9ea1260f2d2b449da6be45d7d5deb5db.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1bc55ce464041d79ccc42eea99d3866.pdf
    • https://static.usrfiles.com/ugd/b8c837_10c490bdd8774643ac54b12024c3efec.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_off00008e5e.bin
d8bab8c3464a5947325e5a0e91b06b0425065fdd04afaece054fab3b3768280e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5E 4908 bytes
font_01_sfnt_off00009f2b.bin
c0b5dd6114fdf5324f41b7f954c5a4d5d16e928783ed6806356e6417ec6a59b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2B 10640 bytes

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