Malicious PDF — malware analysis report

Static analysis result for SHA-256 293be79447557e74…

MALICIOUS

PDF

44.3 KB Created: 2020-08-28 06:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd254f9b8bdfecc869856689f866e97a SHA-1: 07baed1e59b9df27eed609b31e8fee6477d0fd97 SHA-256: 293be79447557e74227fd9f5db768e1bfbead4a4c6bff59ed1df71be007acfb2
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm' pointing to 30 external PDFs. Another heuristic flags a link to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to lure users to harmful content or manipulate search results.

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.cc/pify?keyword=sadelta+echo+master+pro
    • http://fumivire.sparklove.info/uploads/1/3/1/1/131164250/jarewikopapovesasi.pdf
    • http://files.mustafakamaliddin.com/uploads/1/3/1/4/131454190/699667e.pdf
    • http://tapin.dayspringfarm.org/uploads/1/3/1/4/131483167/b3278bdd58e0.pdf
    • http://files.glasssurfacetechnology.com/uploads/1/3/0/9/130969037/napev-vibomem.pdf
    • https://cdn.shopify.com/s/files/1/0459/6708/1639/files/constante_r_de_los_gases_ideales.pdf
    • https://cdn.shopify.com/s/files/1/0438/1714/0386/files/nvalid_request_authentication_expired.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/rogapaxexogogojofe.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/markdown_syntax_github.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/80290571952.pdf
    • https://cdn.shopify.com/s/files/1/0434/3198/5309/files/cbse_biology_textbook_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0432/9514/6139/files/32033569809.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/mastering_autocad_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/7525/3910/files/48121545198.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/70223844741.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/57722723996.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/spongebob_genetics_worksheet.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_off00006fb4.bin
c808d62a0fd7bc93d9d776d3c931fe14e2b67500171945b8824a9876a7e858e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB4 5416 bytes
font_01_sfnt_off000081ee.bin
e12f963f07b87bb54b9b59f306b27277e32864f5c1a661f01c4e81721ee14b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EE 10128 bytes

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