Malicious PDF — malware analysis report

Static analysis result for SHA-256 855031397625c6ba…

MALICIOUS

PDF

50.2 KB Created: 2020-09-01 12:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ed64b21c8537f49e1415a11e957446 SHA-1: 97a2e6f881a94bcb89dd741f581b2c8bfc8889e2 SHA-256: 855031397625c6ba38e7b6325984f65bcc7f29ac9e47b74529dbda54b29474d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm. One of the primary links, 'https://ttraff.cc/wix?keyword=archive+verb+form', is flagged as a known malicious redirector. This indicates an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing.

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=archive+verb+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6b9d02e285a54026bd3ac5b8948e1543.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_7ebc3d04a1cc48efa8f3f9eacefbb7b3.pdf
    • https://static.usrfiles.com/ugd/68ec51_811ea330f83f453c8e08c1e0a418c5b1.pdf
    • https://static.usrfiles.com/ugd/89064d_2b683721fee64fdcac70ee8eea2d152d.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/factoring_polynomials_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/43590571361.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/on_my_way_da_tweekaz_remix.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/zipagagukinewabupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/pazizijonasepokimafuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/49099457011.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/minecraft_cop_games.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/bleacher_report_football_rankings_podcast.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6667/files/nisisijefunovalavaluneju.pdf
    • https://cdn.shopify.com/s/files/1/0432/2941/3544/files/brainy_betty_free_ppt_templates.pdf
    • https://static.usrfiles.com/ugd/71fd01_47742774472a4546b6e20dc787e24bef.pdf
    • https://static.usrfiles.com/ugd/f0e51d_bb50b656e29c4c4b9a2c14445371ba86.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_782a96066dae40ce9c6fef7d9b885902.pdf
    • https://static.usrfiles.com/ugd/aa14a9_a548b2ff7067454188bdc411b72d4ca5.pdf
    • https://static.usrfiles.com/ugd/be19e1_e9db03f71bcb4b3d94ea2c2b680710be.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_off00006477.bin
89f92aabdde7004ffbf98a33738a0a22c289392037cdae2ac32d21fbf347f137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6477 4888 bytes
font_01_sfnt_off000074fd.bin
62255c31b1d051ceb93e84923525e12b3256d0b1e90e558050b871bf00990fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FD 15880 bytes
font_02_sfnt_off0000a6c9.bin
4c0a3f0893f5e69c6acf0c6b7f036872587aec6188c41bdd40a009ab43c82216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C9 16060 bytes

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