Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4f6ddddf4eb586…

MALICIOUS

PDF

42.6 KB Created: 2020-08-17 05:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0ab3afed1d67a5f0ae62d5774dd7e3c SHA-1: db45c2830d93632198890ca6e02dff9df2a3a7e8 SHA-256: 5b4f6ddddf4eb58642f1c67a1fbba8163bd7e8a20b0b45f825a07e528aff6f99
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a known malicious redirector URL supports this. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=pl+sql+code+formatter+notepad%252B%252B, which is flagged as a malicious redirector. This suggests the PDF is designed to lure users to malicious sites, likely for further exploitation or phishing.

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=pl+sql+code+formatter+notepad%252B%252B
    • http://lefobinu.anantsudarshan.com/uploads/1/3/2/8/132814930/8708796.pdf
    • http://files.dreamweaverimaging.com/uploads/1/3/1/4/131452861/3163265.pdf
    • http://files.kkstechtips.com/uploads/1/3/2/6/132682585/zanobajomu-nufevufudaxutut-fivuvebupegokar-jazeruzezinuv.pdf
    • http://vures.millieslittlecloset.ca/uploads/1/3/0/7/130775934/8209092.pdf
    • http://tosav.iamcarlageorge.com/uploads/1/3/2/7/132740900/muwifupaluse.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/36767618008.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/refefabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/tewanuz.pdf
    • https://cdn.shopify.com/s/files/1/0450/0822/4414/files/divinity_original_sin_2_cleave_damage.pdf
    • https://cdn.shopify.com/s/files/1/0440/1653/3654/files/96265440321.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/18068734600.pdf
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/24760747978.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3639/files/isabel_allende_libros_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1653/5720/files/lyman_all_american_turret_press_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/fiwumipaj.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f7c.bin
b5f13ae5a895f35900a9e8db479ec3fba16bf8eb66f21a316aded3eaf5b0f077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7C 5428 bytes
font_01_sfnt_off000071ce.bin
3c5c7e146fcabf98856b30312f72b433269ae904a3ac6194d63fa7459c58dd7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 10472 bytes
font_02_sfnt_off00009598.bin
5f7498f8e433e4c6c47e8ca53e78f46c92ad2660f1d70c8a76bf58ffa4fc47b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9598 1740 bytes

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