Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c08732419c0a093…

MALICIOUS

PDF

47.0 KB Created: 2020-07-19 20:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9da5a6639e28978bfb67b1f83e458ff SHA-1: dd126a150a58a7a5974254f03ca71d0ff92ef8b2 SHA-256: 7c08732419c0a093d1dbe5b7a4cac1539d9c3c57cc4176e3a77e8823531241b1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO link farms. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of numerous malicious links indicates a high likelihood of redirecting users to harmful 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.cc/wb?keyword=slopes%20and%20equations%20of%20lines%20worksheet%20answers
    • http://files.authorkimfox.com/uploads/1/3/1/3/131379612/kemunafejebos_furugamoros_vagububike_wivosoruda.pdf
    • http://files.hairgonerogue.com/uploads/1/3/0/9/130969211/cc02211d3f87c19.pdf
    • http://files.caribbeanshadeproducts.com/uploads/1/3/0/7/130739878/5227294.pdf
    • http://files.crjartwork.com/uploads/1/3/1/3/131379608/4104096.pdf
    • http://files.landlandland.com/uploads/1/3/1/4/131406269/kuloxegegunemosasil.pdf
    • http://files.correllfarm.com/uploads/1/3/0/7/130739658/zajizogixuxasez_gelososexotug_luzesubiwezinuv_pinixasiga.pdf
    • http://files.claire-crafts.com/uploads/1/3/2/7/132740747/2549610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zobotik.files.wordpress.com/2020/07/53967991678.pdf
    • https://fudamowoz.files.wordpress.com/2020/06/jelawezilamuv.pdf
    • https://zebutenot.files.wordpress.com/2020/06/jisirejowemudofin.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/598808668.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/gumakujapowejoxet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/sedilowopekisuzuwefitibu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/jimazef.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/30446503996.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8330/files/60130471010.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/tomebibepaluto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kilezolesosobusafo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/99254871137.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_off00007053.bin
8c7925dc3af53e8b98c7dd208780fa1f0324989df65611420b178978057e4e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7053 5396 bytes
font_01_sfnt_off000082a5.bin
dd25f46f07fe8a307cdf5e991e639f457dba86c98e54e8d1d717e1ad7540d179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A5 13944 bytes

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