Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e841223b711ed96…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 12:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c07e3ff5366063cf928e5e7d1e0a3020 SHA-1: 7ac256ef741d277f6390cdfb9e818ee4f651d3cb SHA-256: 0e841223b711ed96a23f7ef35818ff1f57d6cdc8e59eb3cb4f2337c8eb5b68b2
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 benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for educational content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to malicious infrastructure.

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.cc/wb?keyword=compound%20adjectives%20worksheets%20for%20grade%205
    • http://files.jensnedikerphotography.com/uploads/1/3/0/7/130775174/xebupevuruj.pdf
    • http://files.fountainalleybodycare.com/uploads/1/3/1/4/131437648/2804345.pdf
    • http://files.kim-cuomo.com/uploads/1/3/0/7/130740213/36956958cfe5f.pdf
    • http://megigatu.lawyer-netherlands.org/uploads/1/3/0/7/130776485/5673899.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/rocket_aerodynamics.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/6224257242.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/javascript_key_codes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1805/8901/files/butyl_acetate_msds.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/kodudunazudun.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/57579750554.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/89419708961.pdf
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/pptidos_y_enlace_peptdico.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/79562679751.pdf
    • https://cdn.shopify.com/s/files/1/0452/4458/0002/files/flowers_name_in_english_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/81562635173.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/xamaralepomita.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/57721619081.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000679c.bin
f861572efa1dc032de9a6da499472a4226cda69220eaa77601f2b4d8b62ff4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679C 5860 bytes
font_01_sfnt_off00007b85.bin
70deea89dda6423dec65cbd905bd8499252024e13830cf11b9de8cf5379babf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B85 10840 bytes

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