Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e413e18d4358ebc…

MALICIOUS

PDF

56.1 KB Created: 2020-08-12 04:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 268cfb131c11f40fb13656bc2b33547f SHA-1: eedfc8617d4ac3dc714d826b8f2937800d63061c SHA-256: 5e413e18d4358ebc3f7c6d5c06bbb5e477a32da2bd87548fcc7f1d6c6bbd2878
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination. Additionally, a high-severity heuristic indicates a lure for clipboard command execution, suggesting the document instructs users to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.cc/pify?keyword=bacteria+endospore+pdf
    • http://files.fitscience.net/uploads/1/3/1/8/131856162/6714994.pdf
    • http://files.lynnjohnstonlit.com/uploads/1/3/2/8/132814680/e93271815.pdf
    • http://weziwodeb.aaronlstrong.com/uploads/1/3/1/3/131379578/fexirubupuri-gunigaf-nilud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/xifakusovevawaxuwesexugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/2248499.pdf
    • https://cdn.shopify.com/s/files/1/0439/1898/3323/files/75182437176.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/bogufegigug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/14516020690.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/8243770942.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/1665784492.pdf
    • https://cdn.shopify.com/s/files/1/0438/6793/0789/files/medicinal_uses_of_avocado_leaves.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupesoxozuwimufuvijolus.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/computer_aided_building_planning_and_drawing_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/31194772751.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009d4b.bin
2963aaf8b589e1c246d6b03d8bd8c2f37a58b6a191d37f4477686628910b03bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9D4B 22444 bytes
font_00_sfnt_off000066a7.bin
9f1544feffe42a445ddd136e009be295c8170dbe192f49197a5eaf2ba7eba2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A7 4952 bytes
font_01_sfnt_off0000777e.bin
2f9eea287f710dd73f1ead3c7e79775cba7002b3c5a5d963d5b76f2d4a736898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777E 11096 bytes
font_03_sfnt_off0000c3a4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A4 4324 bytes

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