Malicious PDF — malware analysis report

Static analysis result for SHA-256 634a053238b47946…

MALICIOUS

PDF

43.9 KB Created: 2020-09-01 07:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a9c4b56426b4a654463aaad2f8ac587 SHA-1: 2864ed85a035220b6d7d5afa9bdf07c375360088 SHA-256: 634a053238b47946b05a6152971941c0020e57b8d9d811264f4af1f6e0338da5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links, one of which, https://ttraff.ru/wix?keyword=nuclear+equations+2+worksheet+answers, is flagged as a malicious redirector. The document also exhibits characteristics of a PDF SEO link farm, with numerous links pointing to external PDF files, suggesting an attempt to manipulate search engine results or distribute malicious content. 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/wix?keyword=nuclear+equations+2+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/2006_gmc_envoy_repair_manual_files.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/46853304013.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/31432751537.pdf
    • https://static.usrfiles.com/ugd/d5415a_6b32fcce8fe2430a94c5af111043c664.pdf
    • https://static.usrfiles.com/ugd/48f461_e5ac66c40363408ea220e4259deebcf3.pdf
    • https://cdn.shopify.com/s/files/1/0435/2288/3735/files/classroom_management_in_english_language_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/39596294790.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/dediser.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/auxiliary_verb_do_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/mudixujetuxekoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/bentley_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1742/7352/files/i_wrestled_a_bear_once.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_off00005877.bin
be26df9cb5fb8dc5891123cd6b33149d66fddda199c66aefde012d11aabf89ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5877 5272 bytes
font_01_sfnt_off00006a7f.bin
3676baa2ba56f1d3de5ddca4e320367d355f4caa756503eee2e4a63e2664701b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 10336 bytes
font_02_sfnt_off00008e03.bin
01918ab328aad74c9e8f640f01f786fd0c2e0e9f3673bd8045474dd117871356
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E03 16080 bytes