Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e63925b4e81e36b…

MALICIOUS

PDF

53.2 KB Created: 2020-08-29 18:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf75b872d93e0316199484c5395fb1af SHA-1: d3eddc7dbc170469b4e6926ab0ce14ddab6c6f7e SHA-256: 4e63925b4e81e36bbe66d855dd9a1f7c01c1332881aa6d023e86575276aeb5f9
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a search query related to printable banners. The ML classifier strongly flagged this PDF as malicious, and it also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains the same lure text as the URL.

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.com/wix?keyword=happy+birthday+banner+printable+per
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/vopazubifovexef.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/vazafavajujawukatukux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/gijugavixokaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/6794/8706/files/divine_names_dionysius.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/90322190329.pdf
    • https://cdn.shopify.com/s/files/1/0430/8641/3985/files/buvipujazejesivuxilusumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/bonavita_lifestyle_crib_assembly_ins.pdf
    • https://cdn.shopify.com/s/files/1/0430/6114/9850/files/67102443954.pdf
    • https://cdn.shopify.com/s/files/1/0439/5224/2856/files/zalol.pdf
    • https://static.usrfiles.com/ugd/b8c837_54f5f2e6be474af4b014f18341ef6be4.pdf
    • https://static.usrfiles.com/ugd/b8c837_79a4e57205f04ba58e0393a2ba477be0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b85c4984ff244058e65dd367f31e851.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ddb9238b4a44bd2b891773f8756251b.pdf
    • https://static.usrfiles.com/ugd/8b2c09_1ea89c5f32784793aced0d0856b448fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5adc04bb8e148e19018b756e5eab315.pdf
    • https://static.usrfiles.com/ugd/c3548c_d0f1ed162dd24519a52b2f28c428ed80.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89d6a7b0aeb4f74a62d7157d893c49a.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_off00008f99.bin
5ec487cd732e2d7959012625eb901d3bf46d19a35898cd7e6ceb5728e54b32f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F99 5072 bytes
font_01_sfnt_off0000a0c9.bin
3c44720bab72166e2f6efd5c63b38a14df1f53f7c4408610181bc27cd1337670
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C9 12244 bytes