Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a83d1dcff43f42…

MALICIOUS

PDF

35.9 KB Created: 2020-08-15 06:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8290063fb00ecdd4b3ed60df119ffa3 SHA-1: 22a1d6a39e0ead684d9bf6f8e74a9c6b6da4adcf SHA-256: 04a83d1dcff43f423e5b79405978459580a3fcc14bf594ddce75dfd54edc6ef2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Factoring rules worksheet' and the malicious URL. The presence of many external links, including a link farm, suggests an attempt to drive traffic to malicious sites, likely as part of a phishing or scam campaign.

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=factoring+rules+worksheet
    • http://files.nsp-sports.com/uploads/1/3/2/8/132814930/donov_nowinivib_diborix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/adobe_creative_cloud_cleaner_tool.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/48425564241.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/2040777849.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/12476988032.pdf
    • https://cdn.shopify.com/s/files/1/0433/7926/1590/files/bumagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/84647584824.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/61442648662.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/8221143585.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_off00004ecb.bin
ed7cba62c6b050c6d0124e913d2b49d2d4779be6e65d4af0e820eeb0f5516931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECB 5172 bytes
font_01_sfnt_off00006074.bin
1e4c851826b940a58bc8331d4a0fc043dff7a5ce00484c29f0a300c68cadfa0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 10220 bytes

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