Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b8050f8cbe107e…

MALICIOUS

PDF

42.2 KB Created: 2020-08-15 09:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c78f59314978f23a1c96b3c29d1741b5 SHA-1: 2c5e9607721c92342053801dec3d3cca433e9021 SHA-256: 41b8050f8cbe107ece480ed67c840f23e3a7244be7c54b78b4b6b285a9fd88c7
92 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link. The embedded URL, https://ttraff.cc/wb?keyword=phmsa%20part%20192%20pdf, is the primary indicator of malicious intent. This suggests the document is designed to lure users into clicking the link, likely leading to a phishing page or malware download. No scripts were extracted, and the document body was heavily obfuscated, but the malicious link is sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.cc/wb?keyword=phmsa%20part%20192%20pdf
    • http://files.pineriverassociation.org/uploads/1/3/0/7/130775734/2bb4e87591.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4252/files/berinikenewufuzerobekure.pdf
    • https://cdn.shopify.com/s/files/1/0435/4696/8218/files/24742200565.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/vawekajoba.pdf
    • https://cdn.shopify.com/s/files/1/0430/5269/5703/files/lullaby_of_birdland_sarah_vaughan.pdf
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/97998265568.pdf
    • https://cdn.shopify.com/s/files/1/0433/3918/6344/files/ganpati_aarti_sangrah_marathi_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/lufudopipemiwavize.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_off000063ed.bin
68cfd08ce2ee481bc7367d12ac10c8b9b8f2c429b73f5c80bc1e71819b585476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63ED 5588 bytes
font_01_sfnt_off000076c9.bin
6356978eaf50cb15f6368f104e155ae01c91c6a413c93f8fbae5af1c4fa5e517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C9 12120 bytes

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