Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52aa29a1c61190c…

MALICIOUS

PDF

52.0 KB Created: 2020-09-18 02:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 277afcd8da018c86c2fb2ed8e2041a32 SHA-1: 669a8daae59e5443b83a4ad46c1880c5406e74c7 SHA-256: e52aa29a1c61190c482d390b9905ffdbda24dfccbcb6304b668a3fe497de9774
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'Britax car seat manual' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also flagged this PDF with high confidence.

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.me/wix?keyword=britax+car+seat+manual+marathon
    • https://5b26b887-ab35-4bae-b438-634675452576.filesusr.com/ugd/370021_82a0fbc6b8ce431bba9274fcdfe2081f.pdf?index=true
    • https://7a37855e-ce30-4c8e-9843-9861869e1e92.filesusr.com/ugd/41f880_62dd41391d664b3fb7a5bc9da5ed3c86.pdf?index=true
    • https://9ff1e5f7-eaa6-44db-b2a4-82af6c2595d7.filesusr.com/ugd/4b874d_bafc99100d324296b231331692e08fa4.pdf?index=true
    • https://b90743d4-2cf5-45e5-9af9-137c7d48bc9b.filesusr.com/ugd/954c8b_b737fb04c25a4df6afb944d18506680b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/37307075449.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/25914835111.pdf
    • https://d1ed29ad-720b-4510-b876-06b1929d3dd1.filesusr.com/ugd/e5a943_974b4bb43b1a40c4a1ac7adc4c8f9e98.pdf?index=true
    • https://55367bdb-8aae-499a-bda8-c85867049bb1.filesusr.com/ugd/76aeb6_492b446ad47d4a8cb9235b4b0e6d0c29.pdf?index=true
    • https://ca673d65-eb12-464d-b19b-a86ebc68ab90.filesusr.com/ugd/1b0481_d7a73285007342fbaa60d59feb4f09ea.pdf?index=true
    • https://8bc45baf-93f2-4ecd-8ef5-14ceacef1ee9.filesusr.com/ugd/07e02c_d22c28ea0fa542acaba3e5db7d38afd1.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0486/1090/2176/files/cabin_john_ice_rink_class_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/8478/3509/files/xajipobefoni.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007774.bin
ddd8952144348bf9e180c955566974f9343b717393b1277840db8d7ea8e0b170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7774 5156 bytes
font_01_sfnt_off000088d3.bin
969bbcbcaf72bf63dbc7af8ce8a74741b7fa7a10013d6715e928ca482176a244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D3 10652 bytes
font_02_sfnt_off0000ad85.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD85 16312 bytes

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