Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ccc461429980c9…

MALICIOUS

PDF

55.4 KB Created: 2020-08-03 10:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89f6d0d35cc09934cd4ca9f737e4f8ea SHA-1: 4e9a5c6c01b3265bd236115517b5e9da2a4632ac SHA-256: 08ccc461429980c90d69645b79dae7a4c06ad62d686bf89b19fa362bfde59850
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=nobodyknows+hero%2527+s+come+back%2521'. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same redirector URL and references to 'wkhtmltopdf', indicating it was likely generated programmatically to host these links.

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=nobodyknows+hero%2527+s+come+back%2521
    • http://files.kyasports.net/uploads/1/3/2/8/132814791/3ef9538f32.pdf
    • http://files.markhammeadows.com/uploads/1/3/2/6/132682686/sugidipisinesape.pdf
    • http://files.aradiamondscholarship.com/uploads/1/3/2/6/132682119/0b695.pdf
    • http://gogalufig.languagesnsw-greek.com/uploads/1/3/1/4/131454012/be80195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15518423203.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/23488655407.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/680805015.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/zudapobaru.pdf
    • https://cdn.shopify.com/s/files/1/0437/0179/7019/files/2733974102.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4498/files/jibepodezuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/67857699564.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/fasuluzawo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8217/files/12673114540.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000681b.bin
bb1809b59f5267091bf939e6458fbcd0f6e2e91dcb51e383c2a177023bd0ce82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681B 12060 bytes
font_01_sfnt_off00008fc3.bin
d38450c036a98b66416479fd04963394e8db9cdb70f9a0001fd3c0610f1d4d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC3 5596 bytes
font_02_sfnt_off0000a2c6.bin
cff84db927189c92353ffd09ea8062eadecc56626dde4a99002884d53afdc52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C6 14792 bytes

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