Malicious PDF — malware analysis report

Static analysis result for SHA-256 875c9e2560172821…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 20:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc85d7076928ae3f43ccbeaacba173f4 SHA-1: dad08e52c59d84cfad01c5b5c273925c55e6c610 SHA-256: 875c9e256017282145082be24b4ff18ea9c34bd0da365d430c763110922887bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a malicious redirector, ttraff.cc, which is likely used to distribute malware or lead users to phishing sites. The document body and embedded URLs suggest a lure related to downloading Windows 10. The presence of numerous embedded PDF links, many pointing to Shopify, indicates a link farm strategy to potentially improve SEO for malicious content or to distribute further payloads.

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.cc/wix?keyword=dowload+windows+10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/bareliviriwux.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0589/files/72046068022.pdf
    • https://cdn.shopify.com/s/files/1/0431/4877/1477/files/duxojonukodobuxobuxizaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/bulave_tujhe_yaar_ringtone_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_8657dfc8d9494d70855fa76bb9c1a0e7.pdf
    • https://static.usrfiles.com/ugd/fbccce_7c8466d677534cecb65a404a1ff60109.pdf
    • https://static.usrfiles.com/ugd/b8c837_a670356499dd43e3894f7909b301ef2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa89c02855b941628bacb9b8834f225e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d901285f5b407ca264dc20b77830cf.pdf
    • https://static.usrfiles.com/ugd/d775a9_f1447a7c2c1144cc90baaeaa89736f02.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000613a.bin
ad88b4e9be02b991fee9d2b9cc6b496cdfc44af29892d3869a70ca959f682eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613A 5008 bytes
font_01_sfnt_off0000726d.bin
bcba879e52c3e9190fff89a1c25ae61cab2ae8a4b4f9d2615bd50d7e4113d252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726D 10144 bytes

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