Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e57ad9a4cf0fe6…

MALICIOUS

PDF

63.2 KB Created: 2020-10-29 06:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db39b5a4804d531d5fdf7a2c0d0ca566 SHA-1: 9f0c6ef8b1eb029ea2a101516ff6e0235909dc5b SHA-256: c7e57ad9a4cf0fe6255133d1e6d9ccc074c29c4a6c7e9a99d71a9114ed69dc87
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/123?keyword=linear+motion+worksheet'. Additionally, the document body, though heavily obfuscated, contains this same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, likely used to mask the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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/123?keyword=linear+motion+worksheet
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5f92636266ad2.pdf
    • https://tamagokevalagir.weebly.com/uploads/1/3/0/7/130776783/rofezutonufimutoge.pdf
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f8fa2e665b35.pdf
    • https://cdn-cms.f-static.net/uploads/4375525/normal_5f9a0162a997d.pdf
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5f9a1a0ea3e8f.pdf
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f8dd85cf169d.pdf
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/kudifunezulowiz.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f93ec88abcc0.pdf
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f91600aa3aac.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/2c2a88047.pdf
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f98680edd6af.pdf
    • https://wenozujilemufo.weebly.com/uploads/1/3/4/4/134456287/523e3c7cbb398.pdf
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/nasozid_nivovakagiruwam_wapodewimov.pdf
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8b53efc7161.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0497/6833/3471/files/percentage_calculator_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3756/files/plant_tissues_and_organs.pdf
    • https://cdn.shopify.com/s/files/1/0502/5307/0509/files/uniform_circular_motion_and_centripetal_acceleration_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/5759/1960/files/.pdf
    • https://cdn.shopify.com/s/files/1/0496/2608/7575/files/texas_car_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0481/0748/7384/files/12412482373.pdf
    • https://cdn.shopify.com/s/files/1/0437/3073/1173/files/bivesixaxidodi.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000098ab.bin
d1191a40214b85f84f7c97d2fc1dac8ba1e1af463ab256ada40eae4aa1e3c694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AB 4776 bytes
font_01_sfnt_off0000a8c0.bin
1a4cf3c3d42e669f7002dd18460f1fef77053725a0dabab8e3a9487d5300a7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C0 11028 bytes
font_02_sfnt_off0000cbee.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 16092 bytes
font_03_sfnt_off0000e0b6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 4324 bytes

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