Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c2892adc3bb586…

MALICIOUS

PDF

45.2 KB Created: 2020-08-10 06:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eb021a97c9d17cc7a8a9916c5a269b5 SHA-1: ec547743513c4903b599cb7b5123b0ab81a0942c SHA-256: e7c2892adc3bb5865b503cc0df893935ef37f0fa4b3a790f358b8c70f81faa1a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=building+materials+and+construction+practices+book+pdf'. This indicates the document is designed to lure users to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also 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.cc/pify?keyword=building+materials+and+construction+practices+book+pdf
    • http://fesukur.humanesocietyofdelnorte.org/uploads/1/3/0/8/130874493/gomiv-vimapikel-pagedanalo.pdf
    • http://files.peterandmichele.com/uploads/1/3/1/4/131408942/fudad.pdf
    • http://files.wagnwalkchicago.com/uploads/1/3/0/8/130874612/46c7c84850e30c2.pdf
    • http://files.vanfiretrust.org/uploads/1/3/1/1/131163561/2149748.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/2817494792.pdf
    • https://cdn.shopify.com/s/files/1/0430/8107/2789/files/oxford_picture_dictionary_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0430/1383/2857/files/70557506570.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/vadafefogidemorevakaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/89233871526.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwizesovipijekugufex.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/29364281633.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/86081027542.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/lesejeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/9054/1733/files/ragoligavofemilovunobid.pdf
    • https://cdn.shopify.com/s/files/1/0437/0864/5541/files/absolute_value_equations_with_variables_on_both_sides_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/xusatigagokomunes.pdf
    • https://cdn.shopify.com/s/files/1/0437/7336/2325/files/94513203655.pdf
    • https://cdn.shopify.com/s/files/1/0434/5538/1669/files/fulujimonuzegesodesewaxeg.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/1/0437/73

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000636d.bin
ec6d0f5412a04e42bda138ef4aebd023cf18cfbab5f066f8a5e3bfaf26c3dc9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 5608 bytes
font_01_sfnt_off00007655.bin
55b885af2b0630ba3e1b642a14a4c9e8536183d2790948a96ad7baf9c156ee28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7655 10128 bytes
font_02_sfnt_off000098f4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F4 4324 bytes

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