Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca528e0d51fd344a…

MALICIOUS

PDF

39.1 KB Created: 2020-09-09 18:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13cab374405075fe26cf006ec2d4b6f6 SHA-1: b6518425e2d53e896fdff2c7b83e341354989739 SHA-256: ca528e0d51fd344af8ad9f694d3c9279f20a7a2a044bca488cb7563b37ca306d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF hosting sites. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector and the link farm strongly suggest a malicious intent.

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.club/wix?keyword=united+nations+international+migration+report+2002
    • http://files.charbroilcatering.com/uploads/1/3/1/4/131406736/katijilebaja.pdf
    • http://files.mindfuldemocracy.org/uploads/1/3/2/6/132681038/tubukajelopopezodiso.pdf
    • http://files.salemsscissors.com/uploads/1/3/0/7/130740141/vemasolifesobaxilix.pdf
    • http://files.ellybeautysupply.com/uploads/1/3/1/4/131438397/tenitazo.pdf
    • http://koxipiki.colormagic.us/uploads/1/3/1/8/131856330/e89c01760d404.pdf
    • http://files.beexploration.com/uploads/1/3/1/6/131637876/digulob_fanavexe.pdf
    • https://static.usrfiles.com/ugd/6cabbb_81d9f367605d4e4986a38e5b68418d9f.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8683/files/apply_filter_in_excel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0463/2490/8193/files/tosupatometokomekiboro.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_off00005ab8.bin
8de5d6d2ac6b0aca389e418beb9dfcd55bf20c7f00908df3175766deeb63f0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB8 5544 bytes
font_01_sfnt_off00006d7b.bin
3f205ca4f4296dcdc2ef2330223281e08e534af7c18a0b3ba482742513e8b455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7B 10192 bytes

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