Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3746cd10a4bbd2…

MALICIOUS

PDF

38.7 KB Created: 2020-08-19 14:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d009546b1d9d7aea1b195d211605f8de SHA-1: 4eb3ad707e6ed24e0c58b61767da0c3132e30aae SHA-256: 4d3746cd10a4bbd2f05a1acc20285f0b0f49bca29bdffe18b20d15cac6438876
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for free software. The PDF also hosts a large number of external links, many hosted on Shopify, which is indicative of a link farm used to distribute malicious content.

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.com/pify?keyword=free++duckduckgo+browser+for+pc
    • http://files.pantoffelkinovideo.com/uploads/1/3/0/7/130776826/xikezovi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/menewolowexazazutotesa.pdf
    • https://cdn.shopify.com/s/files/1/0448/3494/7233/files/mawupowowol.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1919/files/hyper-_v_replica_certificate_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/36977256163.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/tejipebebugejuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/39045477030.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/blood_of_a_stranger.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/wirizuwolinerivibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/libros_sobre_el_aprendizaje_significativo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/xivuwakafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/98081750946.pdf
    • https://cdn.shopify.com/s/files/1/0434/5833/0786/files/mefamizozil.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_off0000587c.bin
6a414bbfd5986e929a7868b351b418aa6e6ec1950aa4e1360a646e3c7ce105f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x587C 5332 bytes
font_01_sfnt_off00006ac5.bin
79b53c5e2418661b852463ba5e18d33cc44cefc05933b463582355760cc5ddac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC5 10308 bytes