Malicious PDF — malware analysis report

Static analysis result for SHA-256 1841963de2ed5168…

MALICIOUS

PDF

47.6 KB Created: 2020-09-01 00:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a6e7cba962ef66881678f6b56626838 SHA-1: 1fd57c29d560db2b61a1a6f6b096c3dc19e04f3b SHA-256: 1841963de2ed5168bf14e7189aac6fbbe73a08aac322884837e2c598a6d8dd6a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=cuneiform+alphabet+chart'. This URL is likely used to lure users into a phishing or malware download site. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness.

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/pify?keyword=cuneiform+alphabet+chart
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e6b09d0ef47d445bb7a58f12c76a5975.pdf
    • https://static.usrfiles.com/ugd/e6092c_3415ad25ab7d42afb25c833dc927d159.pdf
    • https://static.usrfiles.com/ugd/58a813_a637631fbb864783bae697d99ff84699.pdf
    • https://static.usrfiles.com/ugd/12daa7_ba17ab495c824392b1f7b505dd9a4a73.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/reea_feat_akcent_rain_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8086/7235/files/54742315422.pdf
    • https://cdn.shopify.com/s/files/1/0463/3572/1628/files/young_thug_jeffery_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0436/4559/9904/files/ackermann_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/1565/0980/files/50328070101.pdf
    • https://static.usrfiles.com/ugd/9374a7_d3ca3e9043cf4197b78a5b667ae123ff.pdf
    • https://static.usrfiles.com/ugd/d1c05f_a62d43a59fb54265a2e9b1d9d033c541.pdf
    • https://static.usrfiles.com/ugd/97493d_e7c6e56e71b544bfb1c86d72a1526d72.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_eb1903b8ac1e4c529e230177725aba7f.pdf
    • https://static.usrfiles.com/ugd/d17951_e3988ef7bfd445178ca8458790b5fcf8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006650.bin
84f5f514a0c659e91dd58e471398e052a95a7257cb16ce7cfa523b757e1176a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6650 5124 bytes
font_01_sfnt_off00007788.bin
4152ef822ae773c9237b9f96dc23faa30cf6dd70ce8d7a5f0acd4b2def6b49f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 10548 bytes
font_02_sfnt_off00009bbf.bin
c4441e48b2f68604838bd51e3092d1355fc6ad73caca962ec91191dcf11ac5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BBF 16224 bytes

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