Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac47e625fa5ac8a…

MALICIOUS

PDF

49.0 KB Created: 2020-08-18 21:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 310993e733693831d583992fdd78007c SHA-1: de8906a890d0b8e7675f492b9a1e7cd7edde5958 SHA-256: 3ac47e625fa5ac8a88a9bbe23385858cd8be6184dac4fb1915dde087b0e1401a
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with a primary redirector URL identified as malicious. The document body, though heavily obfuscated, contains the phrase 'Best regards in spanish informal' and the malicious URL, suggesting a social engineering lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed to redirect users to potentially harmful content.

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=best+regards+in+spanish+informal
    • http://files.somekindofsimple.com/uploads/1/3/0/7/130739509/jeputejo.pdf
    • http://files.janicehidemi.com/uploads/1/3/0/7/130739697/7915501.pdf
    • https://cdn.shopify.com/s/files/1/0436/6493/3014/files/76784510574.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/30216950129.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7479/files/catheter_associated_uti_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/90028063805.pdf
    • https://cdn.shopify.com/s/files/1/0431/0102/8503/files/34948638495.pdf
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/10303176426.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/38559365441.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/97317608981.pdf
    • https://cdn.shopify.com/s/files/1/0429/3338/7423/files/stacked_bar_chart_d3.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/91908894668.pdf
    • https://cdn.shopify.com/s/files/1/0431/8884/6753/files/jesobumojikovagepadupenim.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_off00007385.bin
d45566688a3e8c62ce8e113e8c02714b78f9eff55e3fff29d76192cf2141bf1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7385 5292 bytes
font_01_sfnt_off0000854f.bin
ef6d2461f4e454083c70f1ea9fda83c10c70f5b412e7e81be1f1754bb3240c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854F 10320 bytes
font_02_sfnt_off0000a887.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA887 4324 bytes

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