Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e7e1eec3f3a565…

MALICIOUS

PDF

41.3 KB Created: 2020-08-15 16:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a90b56475c24347f61ac25a307e0911 SHA-1: 1969c24f00bbbe75be189310711590ad8ff5e800 SHA-256: 37e7e1eec3f3a565e6b39f4330358e9e2cd71676f319a50dd05a34cbd60afcec
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to 'ttraff.ru', suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains the same redirector URL and references a 'library planner template', indicating a social engineering pretext. The ML classifier strongly supports maliciousness.

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=library+planner+template
    • http://files.carsandcashauto.com/uploads/1/3/0/9/130969389/9183318.pdf
    • http://files.profgeasorb24b.com/uploads/1/3/1/0/131070113/b7de277b0bce7d.pdf
    • http://files.macd-mb.org/uploads/1/3/1/4/131407194/67b4edd4f671.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/bawadotigudeke.pdf
    • https://cdn.shopify.com/s/files/1/0439/9448/0798/files/mixorasorom.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/gobazuvidetazoxunodow.pdf
    • https://cdn.shopify.com/s/files/1/0429/2621/1238/files/zunibivubogogilutowur.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/77157981025.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/64535933589.pdf
    • https://cdn.shopify.com/s/files/1/0439/7685/1614/files/cluster_analysis_methods.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/nofoxobes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jujirufevob.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_off000066cf.bin
ac38885ef0f3bce52d3648b7d9c7f24450f74501cbd553a969e5a54822f8c94f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 4968 bytes
font_01_sfnt_off000077a1.bin
1225c7a16241492f9e5db0580d4fab763aadbdc8710a6f4f4af7daa85c7c40aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A1 9788 bytes

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