Malicious PDF — malware analysis report

Static analysis result for SHA-256 4806dc5fcd9ea9c6…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 17:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d896b23171b08fb8b6b1f70d6673e672 SHA-1: b2e6f07c69a35056148eed80a3ac726c06621820 SHA-256: 4806dc5fcd9ea9c6e3ebd4835c1102a0919550f8215ad912e74bd53578f792cc
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though partially corrupted, contains the malicious URL and several benign-looking URLs hosted on Shopify, suggesting a link farm or redirection strategy 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=lagu+alif+satar+cukup+indah
    • http://files.ulainthebox.com/uploads/1/3/1/8/131856498/soxif.pdf
    • http://files.purposefulgrowthcoach.com/uploads/1/3/1/6/131606965/rapema.pdf
    • http://files.lansdownefarm.com.au/uploads/1/3/1/0/131070912/gasegaloferepafexez.pdf
    • http://files.mutationpennants.com/uploads/1/3/0/7/130775484/c17e79e42.pdf
    • http://files.goldstarknox.com/uploads/1/3/0/7/130740490/fapopuforuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridikesomuzumiburowafex.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/google_assistant_for_pc_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/vitaletifazuka.pdf
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/87087624923.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nezax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nipexaledova.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6140/files/79221668416.pdf
    • https://cdn.shopify.com/s/files/1/0434/4758/2870/files/alberta_hunter_education_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/cours_atomistique_en_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7391/9393/files/definition_of_human_development_in_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/87549744443.pdf
    • https://cdn.shopify.com/s/files/1/0437/8443/7922/files/wika_pressure_gauge_calibration_certificate.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c0c.bin
d0853be5de68f15bdffab8fd2d51f9aad25b9ef3306824b511af8c5af54d908d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0C 5076 bytes
font_01_sfnt_off00005d3e.bin
2bfad8813a5029adee04a792e601c721033e831b1fb983031e2fb5496b5806e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3E 14596 bytes
font_02_sfnt_off00008a63.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A63 4324 bytes

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