Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ff7113e6d381d9…

MALICIOUS

PDF

47.7 KB Created: 2020-07-20 14:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebba3eb851297717e452a1848199a381 SHA-1: 96c71d99e7d8ff8311bb060b26860738723a18c1 SHA-256: f0ff7113e6d381d926aa81c484fcb1825f7a2b08b40e8d9a92db3a9306caa0eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm used for SEO poisoning or to obscure malicious destinations. The document body, though heavily obfuscated, contains keywords related to 'child trauma definition pdf' and 'wkhtmltopdf', indicating a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.com/wb?keyword=child%20trauma%20definition%20pdf
    • http://files.davidfrankdesigns.com/uploads/1/3/1/8/131871980/928eb86d464dea6.pdf
    • http://files.filipviool.com/uploads/1/3/0/9/130970016/dolane_divopiwaperowuw.pdf
    • http://files.friendsofmargampark.co.uk/uploads/1/3/1/8/131858287/5874753.pdf
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/mugawolu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1474/1413/files/lelilezenazevar.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/84653714655.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/25265779219.pdf
    • https://ketadotab117676792.files.wordpress.com/2020/07/raxokesugudunozezo.pdf
    • https://ziresiwipaxi.files.wordpress.com/2020/06/kekigomobewu.pdf
    • https://mexudem841182272.files.wordpress.com/2020/07/18904021223.pdf
    • https://meboraxi.files.wordpress.com/2020/06/57163269405.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/girobetopofivapomuriz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/zikinowudenanapeze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/36000258002.pdf
    • https://cdn.shopify.com/s/files/1/0429/5294/9913/files/44155294241.pdf
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/95227917691.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bofudajix.pdf
    • https://cdn.shopify.com/s/files/1/0430/4663/3621/files/29916605615.pdf
    • https://cdn.shopify.com/s/files/1/0432/3003/6123/files/rotuzokelubi.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_off00007da5.bin
7d9c3e63ac8c4cc3c11aca7a54fb1167e3d0099077bcb4bf424c968cff9149f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA5 5008 bytes
font_01_sfnt_off00008e83.bin
cddfc023d8fff88c5f9dd50a95320cb080f1ef2440171fb2ae7756ea75b6e136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E83 10192 bytes

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