Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79cfd970b9978d5…

MALICIOUS

PDF

39.1 KB Created: 2020-08-21 02:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2186b0edffc00df1b40294d2da54f989 SHA-1: 8d0be38cc9a673c6678151731416604798b48f20 SHA-256: a79cfd970b9978d5b92b08d27b95c0f45d89508f512175ae4ff9f5c86da26008
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a search result for reporting tax evasion. This indicates a phishing or social engineering attack. The PDF also hosts a large number of links to other PDFs, likely for SEO manipulation to increase visibility of malicious content. No scripts were extracted, but the primary attack vector is the malicious redirector link.

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=can+i+anonymously+report+tax+evasion
    • http://files.ronaldgrayministries.org/uploads/1/3/2/7/132710694/2217781b6aa6619.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/suzogufamarixibojakuwapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/jevugesisikoguxewewefozaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/wanupuzed.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/xironipujod.pdf
    • https://cdn.shopify.com/s/files/1/0463/4456/8989/files/maselekotem.pdf
    • https://cdn.shopify.com/s/files/1/0451/8893/9925/files/4761168575.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/nazam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/45890458737.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/xijuwebanabobone.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/9140204388.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_off00005c53.bin
c32bebc435382ca85ca0551f10936356113f2b9e9f7529d83e760f2e05e8b2ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C53 5100 bytes
font_01_sfnt_off00006da1.bin
11a3bdfa647f4825593dbe9d3da9c86591969882bc644fb64abd098b412fc4cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA1 10040 bytes

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