Malicious PDF — malware analysis report

Static analysis result for SHA-256 18770ee3deb9c775…

MALICIOUS

PDF

48.5 KB Created: 2020-08-21 15:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 217dbc961604e2a8ac184686fa124bcc SHA-1: 98a0bca17979f40bdbb8da7e4f884d490ec11164 SHA-256: 18770ee3deb9c77587bbfb75220902244d65fe6e5f477c2d45a5cc7c90ff112f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'sound deadening sheets' and the URL 'https://ttraff.cc/pify?keyword=sound+deadening+sheets+pakistan', suggesting a lure to a malicious site. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=sound+deadening+sheets+pakistan
    • http://votivu.australian-spirit.com/uploads/1/3/2/6/132680835/2dfadd8dfe30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/zazalox.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/63672718497.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/analise_de_dados_luiz_favero.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/zudur.pdf
    • https://cdn.shopify.com/s/files/1/0435/7849/1041/files/rangitaranga_movie_online_with_english_subtitles.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/botizutukubudag.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/computer_application_in_business_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/16588496674.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/86152520047.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/radavulofanejagevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/betisisefes.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/coesia_annual_report_2015.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c31.bin
1d3d1dc1c443bd85d691aef27fec52b2ffc7402aef15fa4e84659112f199d159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C31 5260 bytes
font_01_sfnt_off00006e06.bin
0df9832cfc5af80b801f03965aa32ffa143350b02011ec55e095d3f91a351c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E06 2012 bytes
font_02_sfnt_off0000773c.bin
4b5330c2dc3008811333be09d47f2070cb1d3a89ff57c16eb86d54e41cfde4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773C 10588 bytes
font_03_sfnt_off00009b9e.bin
86a22305043906ec9e2b1a2e8b2edb4cf4d539c66c45e7b772ab6c8382683431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9E 16820 bytes

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