Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8f6279451f3215…

MALICIOUS

PDF

49.6 KB Created: 2020-08-23 01:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a3e51d6a471ae5285a723970cf73385 SHA-1: efe824ad85e07fb0c46180ea79aec044e3975639 SHA-256: ce8f6279451f32153ce9dc7e0abaebd912c7f255fc64f955cc9d2d2c89f0cf16
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is used in a link farm to disguise the malicious intent. The document body, though heavily obfuscated, contains the same URL and keywords related to 'pc app store free', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm tactic. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.ru/pify?keyword=pc+app+store+free
    • http://files.hfscounseling.com/uploads/1/3/0/7/130775465/2054505.pdf
    • http://files.hannahviera.com/uploads/1/3/2/8/132814306/sugavesox_livoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8498/files/bodogexisedepezunazaxu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/comparative_irregular_adjectives_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8299/files/nulodomufazojevemivaxam.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/93952243708.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/cell_structure_and_function_test.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/academic_writing_and_composition_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/2537/3083/files/printable_brain_teasers_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/bon_de_livraison_excel.pdf
    • https://cdn.shopify.com/s/files/1/0429/9309/0714/files/kudojiwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/79565537276.pdf
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/nisamuwazekokatisinebit.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_off0000787f.bin
dc29a93d756b80fa21043be31ac24b8c05c8c186ada9025388d3ec42a3b7a956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787F 4612 bytes
font_01_sfnt_off0000882d.bin
e525763e4a748111f7f10220210f7f5fd70b156f5b6b70acdae0879b4859ac35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882D 10336 bytes
font_02_sfnt_off0000ab8f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8F 4324 bytes

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