Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8fd2eb04ca759e…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 17:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3df4c936bd7f0fa5e7eec65dd5bbd5a SHA-1: f5dcbbf1bc2936743f1793f3e24a522cf2f0951c SHA-256: ed8fd2eb04ca759e07eef84a40505cc1860de5d7ae51b2fe1b14475ea7dda52f
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it's a redirector link to a known malicious domain. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, with the primary malicious link pointing to 'ttraff.ru'. The document body, though partially corrupted, contains the same malicious URL and a list of other PDF links hosted on Shopify. This suggests a campaign to distribute content or redirect users through a network of SEO-optimized PDFs.

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=gimnasia+ritmica+brainly
    • https://cdn.shopify.com/s/files/1/0454/3483/1016/files/children_s_ballet_performances_near_me.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/83874027242.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/structural_analysis_8th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/ancient_rome_map_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/92139540803.pdf
    • https://static.usrfiles.com/ugd/a107db_5446ce5cd53d48e088f4809032835e94.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/arduino_format_number_into_string.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/alter_bridge_blackbird_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/jibevawijasivadurus.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0349/files/43468025231.pdf
    • https://static.usrfiles.com/ugd/b8c837_43deaa3efff0478aaac26c00240fc6a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_75215d55ffe24d41beb6b5705f61ffa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b22a068bcf0949e3abe4af7e7f038f4d.pdf
    • https://static.usrfiles.com/ugd/271e65_94057ab5f61a49c28db8171fab71d87f.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_off00005eb2.bin
71935ac640454ffe6324daf5cb1930a93bba8b0a06ea4657b95ab9d5f468b573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB2 5220 bytes
font_01_sfnt_off0000705e.bin
86487455d69c1d7230122948011a815472de2a9efaf4136f2ce91b988f57892b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705E 10076 bytes

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