Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c778aaffaf243e…

MALICIOUS

PDF

58.0 KB Created: 2020-08-10 09:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daaec4dcbf2ca896d78fc27f098a53a0 SHA-1: f3336901e2f75f67662e1618ab24d2b8b793c6d8 SHA-256: 01c778aaffaf243e32829aff3e245b8e6b3801e885003d2af29a0327bf2ebec5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to a redirector service designed to obscure the final malicious destination. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that at least one of these links leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of the link farm, including the primary redirector.

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/pify?keyword=complex+numbers+examples+pdf
    • http://viruneget.radio.10losttribes.com/uploads/1/3/1/4/131453850/9674075.pdf
    • http://files.gainfi.com/uploads/1/3/1/0/131070109/kozudege.pdf
    • http://files.schumacherbrothersfencing.com/uploads/1/3/1/0/131070317/838ef66bc19f12e.pdf
    • http://files.weitzelphotography.com/uploads/1/3/1/0/131070911/9354064.pdf
    • http://files.msgeekyteach.com/uploads/1/3/0/9/130969754/8039491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/the_hobbit_wall_paper.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/83126394187.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/ammonium_sulfate_msds.pdf
    • https://cdn.shopify.com/s/files/1/0438/3031/3122/files/25911491075.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/78790445314.pdf
    • https://cdn.shopify.com/s/files/1/0428/5018/9478/files/xibivuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/43865826643.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1651/files/networking_objective_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/bounded_rationality_herbert_simon.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4343/files/pobemonodavaketolusaferi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8726/files/44375438764.pdf
    • https://cdn.shopify.com/s/files/1/0429/6582/7747/files/fire_works_animated_gif.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7456/files/36071349516.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074b8.bin
7c793c8c4870223aa2d17c3c731aebfb738edd869bc9ceb44b893704e8bf07c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 5172 bytes
font_01_sfnt_off00008626.bin
515112e4ed02124e34305729c8efaae075c1ae4413eed215d44da8fcf7e3d65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8626 15724 bytes
font_02_sfnt_off0000b790.bin
ab685d118e9d0b33767e5607c2d3cbfef219238b2805393651c145cae9583a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB790 16124 bytes
font_03_sfnt_off0000cc8d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 4324 bytes

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