Malicious PDF — malware analysis report

Static analysis result for SHA-256 37621fe1855146a2…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 15:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee1a02c4588da8ce8dc73481828fef60 SHA-1: 49ba7d6ccc233d938b510bebbaf940c1f731e922 SHA-256: 37621fe1855146a2f3789d94fca50636818904ce66a234a95d6d6125495fed9a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to a malicious redirector disguised as a software crack, indicated by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body and numerous embedded URLs, including one pointing to a potentially malicious redirector, support this. 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.ru/wix?keyword=toon+boom+harmony+15+advanced+crack
    • https://cdn.shopify.com/s/files/1/0439/4457/5131/files/72398931834.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/abecedario_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/0617/3077/files/65924712205.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/24588866700.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/madiwukujekesifudibawal.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/78114793226.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/lunefanenulunusobapur.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/richard_branson_books.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b344450f25b49bf95e1d2fa05b85f01.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc4ab14617c14f5c97f5d358f46dbd76.pdf
    • https://cdn.shopify.com/s/files/1/0434/6714/5366/files/abecedario_arameo_traducido_al_espa.pdf
    • https://cdn.shopify.com/s/files/1/0439/3644/8667/files/68713961067.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d1b.bin
df35a45a95094797b5445787a507cb93ba321466f951971f36764a3e9e64f589
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1B 5460 bytes
font_01_sfnt_off00006f8f.bin
4e573c672837cd506ea8953ed064164f64f88593a7f0bf5999bdccaafb441ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8F 10192 bytes
font_02_sfnt_off000092af.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
pdf-font-stream PDF embedded font (sfnt) at offset 0x92AF 16312 bytes