Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae3a20c784092ff…

MALICIOUS

PDF

41.7 KB Created: 2020-08-04 14:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 014a6a20d2fe96250905acc7ad34d85a SHA-1: d8f32d80a20d511d98bcd5e3ecdc4915de15ee32 SHA-256: 6ae3a20c784092ff96f0a35a7c0e94950676313ce11c0124c0245642248bf107
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This indicates a link farm attack pattern, likely for SEO poisoning or to distribute malware. The ML classifier strongly supports the malicious verdict.

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=farm+machinery+management+pdf
    • http://files.thesyncretistrealm.com/uploads/1/3/1/3/131384567/ce38869e6d.pdf
    • http://files.dyanamason.com/uploads/1/3/0/7/130739212/6621378.pdf
    • http://files.beckyalley.net/uploads/1/3/1/0/131070625/kubifugelu_jivivovo_kamifobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/tujotevosizefidij.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/xirugilopumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/daemon_tools_imac.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/vawekajoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/nerineponepejapajixoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/76892240991.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/3600_ford_tractor.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/31038956778.pdf
    • https://cdn.shopify.com/s/files/1/0433/8217/7946/files/40158850319.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/67690752851.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/xopegikirezolog.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006216.bin
15f9df993d8b3e00866f919cb215b43596644b50fd8de0f8194720222be5aa21
pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 5416 bytes
font_01_sfnt_off0000746a.bin
ee935cb7e2711c7f05e9a3d02599e0c580592afe326e73e5e3b7df1906b71557
pdf-font-stream PDF embedded font (sfnt) at offset 0x746A 11084 bytes