Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c90369bf869f064…

MALICIOUS

PDF

57.1 KB Created: 2020-08-12 15:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b41c575e54de7f9dfc47a0ef7d26d7 SHA-1: 7942185660bba3f4a2041cb9368eb0eef63dddf1 SHA-256: 7c90369bf869f0641bfc5f32ba07ca923cb79eacbeb5f8466be504af03ca1ee8
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, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=novena+navidad+para+ni%25C3%25B1os+pdf', points to known malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains hosting other PDFs. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document.

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.cc/pify?keyword=novena+navidad+para+ni%25C3%25B1os+pdf
    • http://files.allweare.org.uk/uploads/1/3/0/7/130739742/3950294.pdf
    • http://files.aromacatering.net/uploads/1/3/2/3/132302716/2028841.pdf
    • http://files.maltascalemodelshop.com/uploads/1/3/0/7/130740477/pitexij_buvovanol_fuxinunox.pdf
    • https://cdn.shopify.com/s/files/1/0438/2566/0066/files/getuleroxivodagog.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/33953187378.pdf
    • https://cdn.shopify.com/s/files/1/0437/1048/0533/files/17197630917.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/business_administration_and_management_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/emotional_intelligence_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6559/8364/files/42134953030.pdf
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/41304019066.pdf
    • https://cdn.shopify.com/s/files/1/0429/0704/1958/files/gipegasar.pdf
    • https://cdn.shopify.com/s/files/1/0429/2195/1391/files/calculus_of_a_single_variable_larson.pdf
    • https://cdn.shopify.com/s/files/1/0452/4870/8769/files/cinquenta_tons_de_cinza.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/11570653823.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/cutnell_and_johnson_physics.pdf
    • https://cdn.shopify.com/s/files/1/0428/6952/2599/files/hotel_hygiene_and_sanitation.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009eb3.bin
77097eeb97526c0eaa3c375db5e127a8991322ffaf6ec31822362e680ddbb395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB3 5244 bytes
font_01_sfnt_off0000b05e.bin
a24474c9d7dc71b3b061a17aae83a67ed66009bea9d166a3c5a09a66200c3f76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 11400 bytes

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