Malicious PDF — malware analysis report

Static analysis result for SHA-256 97865ca8510e48b6…

MALICIOUS

PDF

48.3 KB Created: 2020-09-07 08:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd52b7417d991c272a7b5797c33d055 SHA-1: 35aa434c9b8a3be31948ca2d91de8b66970311d0 SHA-256: 97865ca8510e48b60c24ccfd15054a07112c341eccbda514b9301f584bfa1091
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a resource for 'mathematical programming in c'. The document body and embedded link objects point to a URL hosted on 'ttraff.club', which is flagged as malicious. The PDF also features a large number of external links, many pointing to benign Shopify URLs, suggesting a link farm or SEO poisoning tactic to mask the malicious destination. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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.club/wix?keyword=mathematical+programming+in+c+pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/infographic_pyramid_template_psd.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2703/files/introduction_to_statistical_learning_github.pdf
    • https://cdn.shopify.com/s/files/1/0433/6526/9669/files/vomeropuxedatesoduvizij.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/7408849130.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/chuck_movie_series_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/ikea_king_size_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0462/2267/2025/files/ambili_song_prokerala.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/50918048639.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/10920325298.pdf
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/1755284568.pdf
    • https://cdn.shopify.com/s/files/1/0432/2295/8248/files/thailand_map_download.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_35ea6cc801fc4fe8acaa9876c3063964.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d089fc0ad8e456caa0a9e5e7193cf6c.pdf
    • https://static.usrfiles.com/ugd/3b0c81_607f9f2510de426dadaa3361be07cb3f.pdf
    • https://static.usrfiles.com/ugd/d38238_cf49b07a439349e8bb13f2920c9eca7e.pdf
    • https://static.usrfiles.com/ugd/6c032c_638d4645494d48ef9ad96db9c326c30c.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_off00007222.bin
73603dccc100fd3a8086a1122650957c9fd6d0e05405f37ba307beb510e3d8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7222 5396 bytes
font_01_sfnt_off00008460.bin
8200b9362791a23d991f388c5189194f6cc686ca438a79a81c55c55fd07a447b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8460 15388 bytes

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