Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cc6d7f5a42257c…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 19:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37a0a2f6e907e6768cb736efe377c060 SHA-1: 35e47080bbddd76f02d55fd95fed6dfb8db0d052 SHA-256: c9cc6d7f5a42257c18151e5e0bf50cd5aa51da9d4a5934f1cb58c31042fe4392
152 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 of which point to PDF files hosted on Shopify. One of these links, 'https://ttraff.com/wix?keyword=i+will+survive+partition', is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text but includes the same malicious URL and several Shopify URLs.

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=i+will+survive+partition
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/1769660101.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/60453390610.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/calendario_lunare_2020_orto.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/povomorijoza.pdf
    • https://cdn.shopify.com/s/files/1/0433/2086/9019/files/lalopufaseravoburuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/jemaruwumarinuv.pdf
    • https://cdn.shopify.com/s/files/1/0461/4334/0697/files/39367200003.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/6829723225.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/88381248927.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4105a9085274f2aa15636327422548c.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_a7f3f3ff6d374fc1af64baee7048fdc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_108fc8ab29a64a10a410ea0c5d2b291a.pdf
    • https://static.usrfiles.com/ugd/b8c837_12eb73f1113a465d906497cf408704f6.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_off000053dd.bin
9d16fc33635999d7bf1e3062abecec1f6c87311d73c9dfc33945d7798fb9195f
pdf-font-stream PDF embedded font (sfnt) at offset 0x53DD 4900 bytes
font_01_sfnt_off000064a1.bin
1292d3416309c8902c1e2f3b92545da256cff85e01e15e9f1bca3a7cc5289919
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A1 14280 bytes