Malicious PDF — malware analysis report

Static analysis result for SHA-256 d457e77bbd929b35…

MALICIOUS

PDF

41.0 KB Created: 2020-08-04 10:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51f7e9558b65c3e8b7d2b899721d29b SHA-1: fc9d0f66f137b95696b4a66b423d85832efcb2c1 SHA-256: d457e77bbd929b357820e9dd0242768a401b2896c29e4ac208a844c589a67cad
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel users to malicious content. The document body, though heavily obfuscated, contains the text 'E banking meaning pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for 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/pify?keyword=e+banking+meaning+pdf
    • http://files.kansascrappieclub.com/uploads/1/3/0/7/130776205/dawosawepawusim-robilub-govumilukawe.pdf
    • http://files.eastpauldingyouthfootball.com/uploads/1/3/1/3/131398286/5139327.pdf
    • http://files.wilsonwildcatslearninglab.com/uploads/1/3/1/4/131455621/01f3c4ad8e2f3.pdf
    • http://files.chihongcasa.com/uploads/1/3/0/8/130873826/ef5f3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/61494159601.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0133/files/59835161186.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/xaxulesita.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0429/3296/1443/files/94748536744.pdf
    • https://cdn.shopify.com/s/files/1/0440/5002/2550/files/65199621755.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/jipajudekit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/87481113273.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/67955835599.pdf
    • https://cdn.shopify.com/s/files/1/0430/4053/8773/files/66430035944.pdf
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/12138313531.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/31994706242.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/67164175890.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/43037279406.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_off00006296.bin
a5bd9ca96b60570e0bfd26272a4585ac3914b046b921221d21440f48cee0bf7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6296 5216 bytes
font_01_sfnt_off0000744e.bin
3c81e36cb4e19297ee9ba7cb590edf58a0ae93fee2483a54939014df8319bef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744E 10252 bytes

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