Malicious PDF — malware analysis report

Static analysis result for SHA-256 b568458cd2807a8d…

MALICIOUS

PDF

43.5 KB Created: 2020-08-12 04:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1930310bc60f30937c1b0cfb64fa05b SHA-1: 3eddc805ac007fd6957f4a3b02f0176b99d033ca SHA-256: b568458cd2807a8de98be352031b847fde1e341d58cdd62b98b406f8e2285fc3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.ru/wb?keyword=mild%20steel%20properties%20table%20pdf, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=mild%20steel%20properties%20table%20pdf
    • http://files.pelhamhealthcareassociates.com/uploads/1/3/1/3/131379246/kariwosatasis.pdf
    • http://files.kensingtonconservancy.org/uploads/1/3/2/6/132696030/2855420.pdf
    • http://files.asheleijohnsoncounseling.com/uploads/1/3/2/6/132695829/bf86ace8c.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/55708396132.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0438/0773/5969/files/calibration_procedure_of_ph_meter.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/84926077999.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/nuriwegixonumigasiga.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8359/files/manuleburerabine.pdf
    • https://cdn.shopify.com/s/files/1/0435/3985/7572/files/ruxizigugujuzavarexawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/mubidiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/11286499769.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/bcnf_normalization_in_dbms_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/what_does_ngl_mean_in_text.pdf
    • https://cdn.shopify.com/s/files/1/0447/9375/7857/files/bjarne_stroustrup_c_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/29173743416.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_off00006099.bin
ee5831f16e8afadd13b11e74786a08f98d2c5d4492f766a8efa31b47695a0ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6099 4860 bytes
font_01_sfnt_off0000712b.bin
39f8594e334dbe8e372aeabb0f8af93cfdf698f6c94ebec30ebe8333b5ab5789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712B 9980 bytes
font_02_sfnt_off0000934b.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x934B 4324 bytes

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