Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ffb34fc6cd0456…

MALICIOUS

PDF

40.5 KB Created: 2020-08-19 11:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b66a986ef6d6424b1f4a2badf5328cac SHA-1: 5850e4ae0ef0c8c2c0567e8374657684fc29ddf3 SHA-256: 80ffb34fc6cd0456fc73a05643dc25d7f6de91b0c4486ea8594d1ba41ec6b0fb
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates a malicious redirector link, and another identifies a PDF link farm. The document body, though partially corrupted, contains the title 'Clasificacion animales segun su forma de reproduccion' and references 'wkhtmltopdf', suggesting a content-generation tool was used to create this link farm. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=clasificacion+animales+segun+su+forma+de+reproduccion
    • http://debuk.bereanri.net/uploads/1/3/0/8/130874631/bunotit-tonojedojo.pdf
    • http://xelusavim.christabolain.com/uploads/1/3/1/4/131483068/rotabusezo_muzorebasoxa_rezawavikukebi.pdf
    • http://files.ornamentsofexpression.com/uploads/1/3/1/4/131455883/vojosa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/chinese_alphabet_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5109/files/nodapuwidabuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/dimomaxogefufofazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/equivalent_ratio_tables_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0441/2683/0744/files/barizuzubezezezubiwona.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/christmas_carols_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2867/files/69455737752.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/ritidufipedalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/kufasagimufofupatemolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/44560381844.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/online_adobe_reader_file.pdf
    • https://cdn.shopify.com/s/files/1/0436/9681/6282/files/13020567264.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee9.bin
40151daf5f9b5889ef91f41482d29c98fcfc3a1ca6f69d124ea7ad73a5902384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE9 5380 bytes
font_01_sfnt_off00007113.bin
1fdf2bfc604d52ecca5ae77b36d90241302f8491938df807e91a1b2050810ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7113 10484 bytes

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