Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0884f0bfd6d492e…

MALICIOUS

PDF

72.8 KB Created: 2020-10-31 19:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a07c36b5a768532a6c493a132636d25 SHA-1: 989ab1c43be0d6fedf0145a9ef4470833fff0b8d SHA-256: f0884f0bfd6d492eba3848e7453fce54f88b42036a6780ac2b233b8b9a972722
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass external link farm. One of these links, 'https://ggtraff.ru/aws?keyword=mountain+monsters+new+season+2019+uk', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to lure users to potentially 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://ggtraff.ru/aws?keyword=mountain+monsters+new+season+2019+uk
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/jerukawinatedoj-mumerawej-xadenunog.pdf
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f92159aae28b.pdf
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/mufozujiv.pdf
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f9c04bd5784e.pdf
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5f978a648ec21.pdf
    • https://femekeviwafuga.weebly.com/uploads/1/3/4/3/134345727/5557091.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f8e390f8d9fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juvetaso/7321638215.pdf
    • https://uploads.strikinglycdn.com/files/4328b3bb-8c78-4c1f-9c04-040d143be2b3/metodo_de_investigacion_cientifica_p.pdf
    • https://cdn.shopify.com/s/files/1/0499/2263/7992/files/murray_500e_series_lawn_mower_parts.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e4af.bin
62729ce311bd2013706914470e76689559d74eece2588e3550e8ffe925e02073
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE4AF 26548 bytes
font_00_sfnt_off0000ab51.bin
2675a3804d50a19c1a976dc43be241fbcf5f1aa6f4fbf494f0a5c48ec7ecb527
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB51 5444 bytes
font_01_sfnt_off0000bddc.bin
256f8d576a3e5e4bcc15dfafc364856fb88562a05f3d57495ab68a5c2b705ac3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 11400 bytes