Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd8f6300954812b…

MALICIOUS

PDF

39.0 KB Created: 2020-08-13 19:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e0d41502aceb9f22b50f529b7748df SHA-1: e1d35d2a5039913c9c92ddc4d9cf91bcf529411f SHA-256: 5dd8f6300954812b49baa5348d171a0eb7f7196abbb9dda23e8ba44c2ae6aec6
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous external links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to manipulate search engine results or redirect users to malicious content, likely distributed via spearphishing.

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.com/wb?keyword=trigonometry%20identities%20grade%2011%20pdf
    • http://bagarifi.zenyasastudio.com/uploads/1/3/1/3/131379246/zivemukiwideka-vurubifuteb.pdf
    • http://files.youthultimateprogram.org/uploads/1/3/1/3/131381374/529872d4413270a.pdf
    • http://mamop.evelinemariasmith.com/uploads/1/3/2/7/132740285/70b7d70344f80c7.pdf
    • http://files.martin-watzinger.com/uploads/1/3/2/7/132740278/8825786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0446/5518/1987/files/sample_motivation_letter_for_scholarship_application.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/21903202953.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/formato_de_certificado_medico_escolar_dif.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/barcode_examples.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/english_test_for_grade_7_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/491942095.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0648/files/12823462705.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/wavapikesukoxanuwi.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/farolibulezumizopop.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0343/files/64734213386.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/tetivipukokafejovuxokej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b55.bin
5d16b625554195438076d47e20dd534492284cda68a0a4547d8a2ff1e5e76980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B55 5220 bytes
font_01_sfnt_off00005d06.bin
eee4adcf18ed98ce349d4fb38b73fb9ecc6e48b9d3091bb91f58549d3e79593f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D06 9984 bytes
font_02_sfnt_off00007f08.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 4324 bytes

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