Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b41cf7bd5fea8c…

MALICIOUS

PDF

37.5 KB Created: 2020-08-31 02:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc8c21235eccbe7699b76704a3b93b26 SHA-1: 95aa04ea1576d21081e90d6dadedffe6e42f4a8b SHA-256: 46b41cf7bd5fea8cc6424919bfb10b0137905ece06095418a077a427022f0315
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a redirector to 'ttraff.ru' and a large number of links to other PDFs hosted on Shopify. This suggests an attempt to manipulate search engine results or lure users to malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was largely unreadable binary data, but the presence of the redirector and link farm is sufficient evidence for a malicious intent.

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=chikemuri+no+ishikawa+goemon+sub+espa%25C3%25B1ol
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/1510488576.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/wazopiwogafimiludukawezug.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/kobinafatudapel.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/calandria_evaporator.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/kuzajatojokipir.pdf
    • https://static.usrfiles.com/ugd/6cfc61_ac21dfc83b5e4e22a3412ea37e4d1e3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f942ffbf94a42d18c802cc273553ebc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/69623382572.pdf
    • https://cdn.shopify.com/s/files/1/0429/3319/0823/files/band_of_brothers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/xofidekaguwomipoborifo.pdf
    • https://static.usrfiles.com/ugd/b8c837_30b71bfa4478426f97c1c0f33ffa93be.pdf
    • https://static.usrfiles.com/ugd/82e28d_c53dcb181c8d4a1db5f877c8826554fb.pdf
    • https://static.usrfiles.com/ugd/913720_3577be559290474c8b7851dd46c57052.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_50a5d215465849d3a2a7d1c6e889f0a8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051e4.bin
c040ad07d59113101e152aac1956b6e632a653995493817dafed2f5edb775bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x51E4 5644 bytes
font_01_sfnt_off000064b7.bin
efa2beb1e65a5f40a14933340fa3300114037b1ad51673d29671664f2a5a16f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 10112 bytes