Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c768ac2e2cd559…

MALICIOUS

PDF

46.1 KB Created: 2020-08-05 01:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01822fbc93d0b1cde860e56a7465727a SHA-1: ecbb5cc314c54b67b1d1740a728864ac1a72aee6 SHA-256: b3c768ac2e2cd559569adaa2541329d70bbe368d49803c7e25b5391d6023cdc2
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body is heavily obfuscated and contains a mix of text and URLs, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of numerous external PDF links further supports the SEO manipulation or link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=administra%25C3%25A7%25C3%25A3o+de+medicamentos+enfermagem+pdf
    • http://files.nadirbouhmouch.com/uploads/1/3/1/3/131380008/1919065.pdf
    • http://zutikuj.oakleafenergy.com/uploads/1/3/1/3/131398367/0759c2e6b.pdf
    • http://files.lacuevabearsgolf.com/uploads/1/3/1/3/131381369/8665299.pdf
    • http://files.portraitsinsong.com/uploads/1/3/1/4/131452903/1b399eb2f8d450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/lotuxajodavovul.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6119/files/calling_sehmat_english_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/32760312366.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/honda_hornet_919.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/rixowomogosodoteva.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/6593278834.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/95769012521.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/welding_risk_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0946/files/wadaragawopokimulijojad.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/37118765446.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/wakag.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_off00006f5e.bin
5349dac6b54d5eab3615f0ae6fdd4fa76a42c8d07c1ca7e574be310dae708682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5E 5932 bytes
font_01_sfnt_off0000829a.bin
d543dfe9547718aa703a935fac31bb33d5f1228f1b5de474e5110b2cf973d4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829A 13048 bytes

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