Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a9f2fa1ff63c4b…

MALICIOUS

PDF

51.0 KB Created: 2020-08-26 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 601ebbba10f6f2c61f5b96bda0caa8c2 SHA-1: d28122a318bd9fb94d68f9dda8afe6fef141482b SHA-256: c5a9f2fa1ff63c4b3f7827e06867b4a24d1e3a5c9be966c3ebbac744fa2e4621
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=exercicios+de+soma+e+produto+9+ano+doc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0435/8438/9275/files/26493817951.pdf'. The document body, though heavily obfuscated, contains fragments that suggest an educational context, likely a lure. The primary intent appears to be redirecting the user to malicious infrastructure.

Heuristics 3

  • 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.
  • 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=exercicios+de+soma+e+produto+9+ano+doc
    • http://files.fcssummerreading.org/uploads/1/3/1/0/131070597/4930681.pdf
    • http://pidel.acenumerics.com/uploads/1/3/0/7/130740025/kekugebeg_nevozilo.pdf
    • http://nemibuz.ostendmarineservices.com/uploads/1/3/0/7/130738836/913396.pdf
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/26493817951.pdf
    • https://cdn.shopify.com/s/files/1/0431/4172/6370/files/sugatifariwipimefidefowaz.pdf
    • https://cdn.shopify.com/s/files/1/0447/8962/9085/files/managerial_accounting_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/3698/9850/files/ancylostoma_spp.pdf
    • https://cdn.shopify.com/s/files/1/0429/7090/6780/files/10323923135.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/asylum_livro.pdf
    • https://cdn.shopify.com/s/files/1/0437/0913/7049/files/convert_to_excel_spreadsheet_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0412/files/kawogoziwifozif.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5395/files/vetatiwegemozax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vexib.pdf
    • https://cdn.shopify.com/s/files/1/0429/4367/6582/files/concrete_mathematics_a_foundation_for_computer_science_solutions.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/
    • https://cdn.shopify.com/s/files/1/0437/3698

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006793.bin
da3135eaf231345ed9e0f3456de6dd27ad8714f75dd4e74d2672b7585e5322b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 2864 bytes
font_01_sfnt_off000071c5.bin
8a2e330dc6f54df354b53dcf6c3263b697cbb9875940802bb56dd17e26f3d767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 5252 bytes
font_02_sfnt_off0000837f.bin
ce89ebe0a5cfa800e256adfbe7a26f0eba5f4878aa1346b615d050f2d219dde0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837F 14536 bytes
font_03_sfnt_off0000ae8b.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8B 4324 bytes

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