Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf6026de7433ea4…

MALICIOUS

PDF

47.2 KB Created: 2020-08-30 19:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfc1bf0df98b6e61fe237de93eb8e2c4 SHA-1: 884b32c85b1a1de72513b60b86b1ff0b9511301c SHA-256: 5bf6026de7433ea41ca0b8878d9d6f021a566a756d6d869d8ad3038a98a8fd26
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 a link farm designed to redirect users. One prominent URL, 'https://ttraff.cc/wix?keyword=lotus+portable+pilates+studio', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to lure users 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.cc/wix?keyword=lotus+portable+pilates+studio
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/lawaxiwutezazigunivovel.pdf
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/rabijup.pdf
    • https://cdn.shopify.com/s/files/1/0427/8448/9631/files/90533048044.pdf
    • https://cdn.shopify.com/s/files/1/0440/2236/6366/files/junior_football_gloves_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/37654154527.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/xatafoxotug.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5327/files/76721687145.pdf
    • https://cdn.shopify.com/s/files/1/0450/4908/6102/files/sims_4_parenthood_digital.pdf
    • https://cdn.shopify.com/s/files/1/0433/8614/2876/files/84722141603.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_7de709817d2242529565ae97e2f8edda.pdf
    • https://static.usrfiles.com/ugd/f96b02_74aeddf0a8274ed69ded21a1ecd14e07.pdf
    • https://static.usrfiles.com/ugd/4f270c_48482ee50a8b4556bff191274938ebf7.pdf
    • https://cdn.shopify.com/s/files/1/0437/8384/8093/files/2011_nec_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/application_for_canadian_citizenship_certificate_instruction_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/3338/7423/files/john_deere_x300_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0963/files/61617235755.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063fd.bin
0766da0fa00d9f63b6921605fd08b076e53daac811f62b5bceaa7fe4c238c20a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FD 5032 bytes
font_01_sfnt_off0000751f.bin
cae5f409cbba4d28266452c4490f3330da9eabe6d9f71a69b8ea02e390e54206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751F 10916 bytes
font_02_sfnt_off00009ab0.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB0 16144 bytes

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