Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b2355387019b34…

MALICIOUS

PDF

72.9 KB Created: 2020-08-25 20:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3942c2d9d26d8f13d0ba4336e0550e9b SHA-1: caa347b0b3dbaa5396f5252558ee146ad4467919 SHA-256: 34b2355387019b349df383866e2dedf49605d3fab14e195350e6a3bafaa2c029
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to redirect the user to a malicious site, likely for phishing or to download further malware.

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=toms+river+book+pdf
    • http://files.norwinxc.com/uploads/1/3/0/7/130739533/97d413a4.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4502/files/71251136376.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1163/files/1390657752.pdf
    • https://cdn.shopify.com/s/files/1/0432/0378/8960/files/73470688216.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/fewizorofekawalenux.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/75895332717.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0746/files/35646423103.pdf
    • https://cdn.shopify.com/s/files/1/0436/0906/3582/files/bukotenudakowopoza.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/reliability_analysis_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7414/files/power_spread_offense_playbook.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_off0000e1cb.bin
4cc384378eaca9385f7cc67e8f8d5f00a8b35f0e7933b0fb99d78e59673d9b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 5156 bytes
font_01_sfnt_off0000f34a.bin
da7babdefdcb2f15232f209e85c6f158082956fe9e5626f81a2fd1b065357d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10568 bytes

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