Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbf8e9eb0c54711…

MALICIOUS

PDF

55.0 KB Created: 2020-08-30 19:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 276d50f0992f226c3d34b3b14dffde9b SHA-1: 9015a63de868b5c02c9c242e2a658d67c33a395d SHA-256: bdbf8e9eb0c54711d9fbcb90f3870ae2d82a54ef52c983e6283c424fbc168049
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify-hosted PDFs, a technique often used for SEO poisoning or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=ex+machina+script+pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm strategy are strong indicators of a phishing or malware distribution attempt.

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=ex+machina+script+pdf
    • https://cdn.shopify.com/s/files/1/0434/0711/4391/files/10632111571.pdf
    • https://cdn.shopify.com/s/files/1/0432/3832/6432/files/dafabuxilegowom.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/60823262766.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/ketuxopodo.pdf
    • https://static.usrfiles.com/ugd/5b604d_869cf2826c264c6c95c0b2c1b97f234d.pdf
    • https://static.usrfiles.com/ugd/1f2646_f74afc60f50249f7a54f514322f966e0.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/kakaluvapesupisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/94436769626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/minirefotapobizezuloxot.pdf
    • https://cdn.shopify.com/s/files/1/0435/8111/2483/files/22794148889.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/93087323286.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/fallout3_ps3_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2881/files/xanetenoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2431/8618/files/40197969318.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/31201190636.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.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_off00009a62.bin
653b469ae479137f59e40c51015d09f8f0d8e082ac25265eeb465fc7a6965a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A62 5388 bytes
font_01_sfnt_off0000ac8e.bin
79b0c89803ef172bbf154faadd6f8c468884fa443c28d08e17486fbac7a04867
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8E 10060 bytes