Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8d3158229c3e8d…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 15:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c727c09add457f4bf56118de5e5f7596 SHA-1: 275dfe9b28dc22631611d0b2d599b6f14a4dc600 SHA-256: fd8d3158229c3e8d0fc6262f90cb566d2151eb31acc208284d20d7ac7987dcb5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with a keyword related to professional certification. It also hosts a large number of other PDFs on Shopify domains, likely as part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or scam 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.cc/wix?keyword=safe+scrum+master+exam
    • https://cdn.shopify.com/s/files/1/0428/9921/0407/files/director_resignation_letter_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/bhai_ka_birthday_song_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/81148283227.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/pabipegemigeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/7786/0516/files/tofije.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/kopuredukopagarixazavudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/326582495.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/xofusoteberegoxasevivijav.pdf
    • https://static.usrfiles.com/ugd/6908d7_46c1ffd0cb8f47ac83fff0ef342f10be.pdf
    • https://static.usrfiles.com/ugd/b8c837_91508e7358304576842ae55e365186eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_84a0b93aa568496e8e1fa3454ffecf22.pdf
    • https://static.usrfiles.com/ugd/b8c837_1786e8a9697c40ec83e66de10965cb1e.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_off00006d5a.bin
2d9ae033e9bd3c9a52d4e66323350a197a38a37185c4752131a2c0d6463b5235
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5A 5164 bytes
font_01_sfnt_off00007ed4.bin
5ecef241cb6dbb600032e9ee05d9f8225c32c60b40c4862b4f9d2c0e9fb8721e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED4 10652 bytes