Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b701d8909924c47…

MALICIOUS

PDF

53.8 KB Created: 2020-07-30 08:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0df3bf9fd6eb1d1e1a6ae2e680dcdee SHA-1: 1e781bd3277d6114e5f7cc7d0eee7e2ecfa0552e SHA-256: 6b701d8909924c47165d2754832a9b30d0dfff576099be5c5ed73199baf73f57
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, appears to be related to academic assignments, a common lure. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports a phishing or redirection attack pattern.

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=aiou+solved+assignment+2+code+1424+spring+2020+pdf
    • http://files.metaphorboutique.com/uploads/1/3/1/4/131453615/sikotuzawoxupe-pujarikolapa-zibukasasa-joleki.pdf
    • http://files.eaglepointirrigation.com/uploads/1/3/2/6/132681150/misidalobinilal.pdf
    • http://files.atxsandlot.com/uploads/1/3/1/4/131437064/8126739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/48008878126.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/jobiwirimozemovu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4143/0440/files/rexoxadopodizujulub.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1542/files/kokasages.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/lorixukinepuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tazoxusejeko.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/42223523518.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/47181179039.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/81128230468.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/69671522764.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088d9.bin
82654765ae49cea599af3f104f87c826d60bb3d86fb415cf0817c640f85e693b
pdf-font-stream PDF embedded font (sfnt) at offset 0x88D9 5820 bytes
font_01_sfnt_off00009c95.bin
236c006f8ac502fe18ab0d85e79ad2d5ec9825334f2d94bc7ca77080c2049286
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C95 1592 bytes
font_02_sfnt_off0000a4b4.bin
89c4e7c8b5a66b1ba9b73fb93b7d9f325d12d342a454b5f62151ac807106c464
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B4 10628 bytes