Malicious PDF — malware analysis report

Static analysis result for SHA-256 55de23a6a2344af7…

MALICIOUS

PDF

51.5 KB Created: 2020-08-29 23:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eea9566e0f1107fb3a80677c0402f43c SHA-1: cde5fe63a0c143f3508b204916bba95a3befc49d SHA-256: 55de23a6a2344af75a4489f17c2a907a038b78ec7ae908f7cab56f7a14ac7859
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=secretos+cortesanos+pdf, is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other links to external PDFs, many hosted on cdn.shopify.com, indicates a link farm strategy, likely to improve search engine ranking and distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=secretos+cortesanos+pdf
    • https://static.usrfiles.com/ugd/b8c837_1cbcdd66fa46440fabbe87efdfb1d3b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b7f69f54454e3f9f877e93227c4a94.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec3d689228164c1db9f51abafd93d476.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cc4d72f53e8455cb2471284def5cf10.pdf
    • https://static.usrfiles.com/ugd/73cb9e_ef6c586c93e943d2850510486514a9ec.pdf
    • https://cdn.shopify.com/s/files/1/0448/0453/8528/files/gijusapofasufipokodipigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/kodovisofuzexanesabenawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/97557113491.pdf
    • https://cdn.shopify.com/s/files/1/0434/8615/0816/files/vexet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/aldehydes_and_ketones_laboratory_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/17368736882.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/50427859732.pdf
    • https://cdn.shopify.com/s/files/1/0444/3789/7383/files/letexelukizugadet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ba9.bin
6bc0aae0b3867d3d520d8b832c14115f21618fe9b4a4094216d614cda33bdc81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA9 5220 bytes
font_01_sfnt_off00006d64.bin
59cadfd4a46a2750ca8135222201d46bbd9f497e1e33d85040ceb89310e57c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D64 5084 bytes
font_02_sfnt_off0000801e.bin
cf45c9c9e0e07769a49b1013e5ebe6afd845df8042e227898186517025e19115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801E 12084 bytes
font_03_sfnt_off0000a7db.bin
437b28c3b7d43baf17c2208b5a858330cf29d29944794125993ee83d307c439e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DB 16688 bytes

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