Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c529353169f5cfd…

MALICIOUS

PDF

44.0 KB Created: 2020-08-02 03:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c515a0a65d59f012c97db09e06a42203 SHA-1: eb537d0d759e7aa65a9cd19203814994b085ba6a SHA-256: 1c529353169f5cfda91075bfa46b0e3df662e4b9d0dedb40c7b9b14383361221
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

This PDF file contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, indicating a link farm. One prominent link directs to `https://ttraff.ru/pify?keyword=baby+shower+agenda`, which is flagged as a known malicious redirector. The ML classifier strongly identified this PDF as malicious, supporting the conclusion that it is designed for malicious purposes, likely SEO manipulation or distributing further malicious content.

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/pify?keyword=baby+shower+agenda
    • http://files.eatwellhalifax.com/uploads/1/3/0/7/130775221/c7afdfa84992c20.pdf
    • http://files.seattlechronicseeds.com/uploads/1/3/1/3/131381850/3314363.pdf
    • http://files.river-city-wings.org/uploads/1/3/0/7/130775633/e77377c9.pdf
    • http://files.masakoonodera.com/uploads/1/3/1/4/131406391/5538736.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/69721133636.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/82815239589.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/51690335889.pdf
    • https://cdn.shopify.com/s/files/1/0437/2152/3349/files/povilojojilusuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6437/files/leduwedefigefodeno.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/66607979710.pdf
    • https://cdn.shopify.com/s/files/1/0431/1672/4386/files/11243437543.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33647917740.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/xebizalid.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/73350125163.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/svnadmin_add_user.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_off00006cd0.bin
d511cbd07606ddd8fc604ed436f7b793cd3f6375a965d193fa0c58461c6c9a99
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD0 5436 bytes
font_01_sfnt_off00007f5a.bin
96e188bcc5826b6cd19683623e2968969a114b85a744f2302f7aba3cd2ea03c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5A 10584 bytes