Malicious PDF — malware analysis report

Static analysis result for SHA-256 745bc7ede94be992…

MALICIOUS

PDF

43.0 KB Created: 2020-08-11 13:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c50609ee1a0e070bcb3d2fd71f7ad8 SHA-1: e46e2865df5a6719669d3a4d5d485ff8a2e1dfe8 SHA-256: 745bc7ede94be9921033bb22d13e12f77429d4467708cc4939de36e52b306945
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs are the primary mechanism for the attack, likely leading to further malicious content or phishing pages.

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=escala+cromatica+guitarra+acustica+pdf
    • http://fivim.rockthecosmosnovel.com/uploads/1/3/0/7/130776208/jefeba_tarititawaja_waborumaregowi.pdf
    • http://files.themanicuredyogini.com/uploads/1/3/0/9/130969158/gebizujid_fajetopupax.pdf
    • http://files.myswagbag.org/uploads/1/3/1/3/131384368/bovoxol.pdf
    • http://dunim.510warrenstreetgallery.com/uploads/1/3/1/4/131408899/d6f0e2df4.pdf
    • http://gupumib.wellingtonartgallery.com/uploads/1/3/0/8/130874038/wozimokilevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5798/5189/files/roblox_remote_function.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1959/files/8623439615.pdf
    • https://cdn.shopify.com/s/files/1/0438/2438/2114/files/lubaralirunis.pdf
    • https://cdn.shopify.com/s/files/1/0435/9602/1919/files/how_to_convert_to_word_on_apple_computer.pdf
    • https://cdn.shopify.com/s/files/1/0432/5913/4112/files/geometry_transformations_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/sheet_metal_gauge_thickness_in_mm.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/loregur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/gisazi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/64481389795.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48695811849.pdf
    • https://cdn.shopify.com/s/files/1/0440/7263/2470/files/persuasive_writing_prompts_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/89325083540.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/zutizakedibepetad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000679d.bin
2cbd76b314c3e37503ebc22f2c0d47872f21541cddd4b0ca375a683bacc14541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679D 5432 bytes
font_01_sfnt_off00007a00.bin
e08fb710a016cb97a7868580a1be9a9a35b7e4cff3b4262370a6e9c75fee59c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A00 10740 bytes

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