Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2d28db3ffc0518…

MALICIOUS

PDF

42.8 KB Created: 2020-08-03 12:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c354e497a59d5b1cc9791ebe682265 SHA-1: 942a1778c8f41796d6ad3af0548ad2f5abef98d7 SHA-256: 0c2d28db3ffc0518961d730d1356961bff83269c10c379ec707ae884204ad5f8
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wb?keyword=dialogue%20words%20worksheet', suggesting a lure to a malicious site. The presence of many external PDF links indicates a link farm, likely for SEO manipulation or to distribute further 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/wb?keyword=dialogue%20words%20worksheet
    • http://files.olneymdtravelbaseball.com/uploads/1/3/1/0/131070518/bipiwifidefej-wikuzudiw-virawimema.pdf
    • http://files.vscommunityfest.com/uploads/1/3/1/4/131453081/9139585.pdf
    • http://files.jamesebarrguitar.com/uploads/1/3/2/7/132740423/3346697.pdf
    • http://files.nbmarysville.org/uploads/1/3/1/3/131379054/ladajatizani-vuwopu-buteto-xenakof.pdf
    • http://files.wataworx.com/uploads/1/3/1/0/131070313/regufuvani-zeduvofogujalo-wotumigixume-xupidevolov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/8524490992.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/kupafus.pdf
    • https://cdn.shopify.com/s/files/1/0440/7879/2869/files/nepek.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/puboguroxepuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/4858657509.pdf
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/28_day_jumpstart_challenge_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6361/files/jakokoranuxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/97933399539.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bibekejufalakudogaloseja.pdf
    • https://cdn.shopify.com/s/files/1/0429/5757/0207/files/26446035501.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/rivelunito.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_off0000681c.bin
9d71bec3cc47308c9d487d1c374f64c48dbc0030a1e2e46a8a119767e1c086ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681C 5240 bytes
font_01_sfnt_off000079fd.bin
0df2afb6072ae04078ff19dd2b5d531b91032d5017b0f711b6fb87e24d15638f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FD 10856 bytes

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