Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dc9fe098d6ebdf…

MALICIOUS

PDF

42.3 KB Created: 2020-08-15 13:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d2cec53aaa48393074292e30da9ce1 SHA-1: 4b5c3af7109759e635fd8177ead28956815c3990 SHA-256: d3dc9fe098d6ebdf572dc55f0d9614069d6f526ce7d98adf69fff9795989044e
152 Risk Score

Malware Insights

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

The PDF contains embedded links and text designed to appear as a free book download, but the primary link redirects to known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed for SEO manipulation to distribute malicious content. The document body, though partially corrupted, contains the lure text and the malicious URL.

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/wb?keyword=english%20tenses%20book%20pdf%20free%20download
    • http://tuben.agdersymfoniorkester.com/uploads/1/3/1/3/131383483/ffc895135.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/83337838009.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/24653932822.pdf
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/gavavoviguzifuvep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/vabufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18842325712.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/criterion_related_validity.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1706/files/xitozikomuregamudag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/mejowunexerelogawelamoxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/bukuraliwadolamexozasaw.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_off000067cb.bin
19894d6e776797b0b3af4f04c4d7837776e6dadd7cdca9aa93eb867eec5ace3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CB 5556 bytes
font_01_sfnt_off00007ab3.bin
f2a5f4a266c8dc2eeb296a5236357e4d0f1d41d60c22f3b9f68a5a9099c0dd5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB3 9968 bytes

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