Malicious PDF — malware analysis report

Static analysis result for SHA-256 593e79ffabfe6084…

MALICIOUS

PDF

57.6 KB Created: 2020-08-18 14:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ce7e7379f3309c49140c3fb261ed00d SHA-1: 3774f7a957161d4071236313f42c4e6946b40974 SHA-256: 593e79ffabfe60848f3bcfad20447bc380d9cb5565f82068224355b6f8495761
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru, which is disguised as IELTS reading practice material. The ML classifier strongly indicates maliciousness. The PDF also contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic to distribute malicious content.

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=ielts+reading+practice+academic+2018+pdf
    • http://files.liquidlightbodyworks.com/uploads/1/3/2/7/132710783/guwivinabefo-dudojagosa-wedetifoluve-vepipupinu.pdf
    • http://dijodil.warwyckitsresearch.com/uploads/1/3/0/7/130775350/rusuwokoromenox.pdf
    • http://files.matsujewellery.com/uploads/1/3/1/3/131397996/2d9338a3b.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/39867286940.pdf
    • https://cdn.shopify.com/s/files/1/0435/0253/4822/files/narasimham_committee_report_1991.pdf
    • https://cdn.shopify.com/s/files/1/0444/6240/7847/files/characteristics_of_research_design.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/5690041680.pdf
    • https://cdn.shopify.com/s/files/1/0433/5386/6408/files/39267650112.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/fezupepovezizas.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/xaxamijugaguritatinip.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/doodle_god_guide_chapter_4.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_off0000a127.bin
1fba74948062ccf24ece0680919e43000d8a21d2517c4a9fd9581ee6927390de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA127 5932 bytes
font_01_sfnt_off0000b540.bin
2052058c0ff861643c04d0bbef61556f2a177033c836933b40998a199ea4e52c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB540 10580 bytes

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