Malicious PDF — malware analysis report

Static analysis result for SHA-256 58636fa34377263d…

MALICIOUS

PDF

51.7 KB Created: 2020-09-01 12:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf8bff74afb40c839085caf79df6f63 SHA-1: 8619769ff44e755a16d73b75d8648eacbe12a258 SHA-256: 58636fa34377263d1738e76532d533e6c0644c13e6e9a18b76aed15d45a28cd9
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm and a redirector link. The primary malicious URL, https://ttraff.ru/wix?keyword=first+aid+kit+fireworks+sheet+music, is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links pointing to PDFs hosted on static.usrfiles.com, suggesting a coordinated effort to distribute malicious content or conduct phishing attacks. The ML classifier strongly supports the malicious verdict.

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.ru/wix?keyword=first+aid+kit+fireworks+sheet+music
    • https://static.usrfiles.com/ugd/b5aed9_b78b623a4e504d748cc7343948d70710.pdf
    • https://static.usrfiles.com/ugd/409ca8_e532920892504a8f8ba7323a47e99b44.pdf
    • https://static.usrfiles.com/ugd/cafc24_3c76d13ce6b447bc8f612a628857378f.pdf
    • https://static.usrfiles.com/ugd/c345b0_e65210d8b82d4c10a46671376d638a48.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/oceanography_an_invitation_to_marine_science_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0465/5788/8662/files/chemicals_of_life_biology_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/tatokiguvonadopem.pdf
    • https://cdn.shopify.com/s/files/1/0428/7122/6534/files/ihss_alameda_electronic_timesheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/7911/3635/files/xojazibopijejogaxunujetav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7417/files/tedebogurivuxafifoli.pdf
    • https://static.usrfiles.com/ugd/a48928_f8c3e4b70ab54c2d8c0aff7a17724d21.pdf
    • https://static.usrfiles.com/ugd/d55797_8b449f335ed1414490eb66808e4e3700.pdf
    • https://static.usrfiles.com/ugd/a771bd_619113b5adcf479294cb03a573ce83a8.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_6502afc4f98f4d728877877f4519cdf8.pdf
    • https://static.usrfiles.com/ugd/cb4a18_84e3947dc8204eb9a1ac12a5c650954f.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_off00007e4b.bin
17163218c241b026c540114d0f22bbc724e39a1daf1c83c91dd5d38e45f30225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4B 5340 bytes
font_01_sfnt_off00009063.bin
cfc5f41a46e0de2aa71ce6c14d4f5daded7efef19953da4cbb7eeb9631627fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9063 15896 bytes

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