Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae031d3dd110da92…

MALICIOUS

PDF

46.2 KB Created: 2020-08-07 14:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e1dd6c267ea77b08fe93c090266807d SHA-1: c59b94c052aa8abb53fb360887f3445759e36559 SHA-256: ae031d3dd110da924c5e4cc0ffd9f464c93c36385f18649acecb0a4d2dbe87f6
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, masquerading as a useful document. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute further malicious content. The document body text, though partially corrupted, contains the URL that is likely used as a lure.

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=persuasive+writing+checklist+pdf
    • http://files.futurescapes21c.com/uploads/1/3/1/3/131398357/8743571.pdf
    • http://zikor.ryan-wheaton.com/uploads/1/3/0/7/130738720/jetorox.pdf
    • http://files.foursideddesign.com/uploads/1/3/1/3/131379706/furelijeti.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/vejowudataxuvudinow.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/49097818130.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/22707145186.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/84140266845.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9563/files/patasukixuvulekuxeto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/bagifiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/79674733095.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0967/files/83223042223.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/48523118853.pdf
    • https://cdn.shopify.com/s/files/1/0435/4618/1787/files/53376022463.pdf
    • https://cdn.shopify.com/s/files/1/0432/0650/8701/files/elementary_differential_equations_10th_edition_solutions.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_off000076ee.bin
773fd3f1eaae524c9a6be3797ed428cae1eda202f46ee6f01086a738b73c5695
pdf-font-stream PDF embedded font (sfnt) at offset 0x76EE 5632 bytes
font_01_sfnt_off00008a28.bin
777b0a0217f2fd22532dc3fd9f2fefb8db21c09e7dc1b66af1417ec897f1dc15
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A28 9904 bytes