Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74950d9fd0d8c4c…

MALICIOUS

PDF

39.9 KB Created: 2020-08-19 02:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eb8556f8b7b710c3b779923d0c576a0 SHA-1: 74de8605e7526aa9aad61ed1b87d4b5f37a86d67 SHA-256: a74950d9fd0d8c4c76dd887a485730c1e6532f61562d9ef411012e4bd4c7f2d5
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, 'https://ttraff.com/pify?keyword=ash+wednesday+1973+movie', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a coordinated effort to distribute malicious content or manipulate search results. 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.com/pify?keyword=ash+wednesday+1973+movie
    • http://widof.vishvasdave.com/uploads/1/3/1/8/131856584/bulawa_xinanigujokoji.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/gravely_zt_42_parts.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/world_war_hulk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/gotozodamatawuzegi.pdf
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/vaxogivulagamage.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/antibioticos_de_uso_veterinario.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2103/files/niwofowimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1676/5087/files/graph_paper_template_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8912/files/loxexanagep.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/57810001354.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_off00005ca9.bin
36a025021310d6bafe4b951d7531ec94ca301fc5abcc11d27dbe195847b57a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA9 5632 bytes
font_01_sfnt_off00006fcf.bin
ace872b16abc343d381c6e0810142912b4d930dc693bc942a1fb814dd6d6e7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCF 10444 bytes

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