Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9597bc220d18e5…

MALICIOUS

PDF

40.3 KB Created: 2020-09-01 08:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20b5fa82f77c00226924330585a11705 SHA-1: 58f1ec059a72e3afbe70b557dbdbfbd2e2d7a2fe SHA-256: 1b9597bc220d18e55311a51aac8333b4381ca0cc99b8ee15f09c441557e9327f
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to a size guide, suggesting a lure to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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=elasticated+tubular+bandage+size+guide
    • https://static.usrfiles.com/ugd/b8c837_faf4b760045644569e9bacd5aefa5609.pdf
    • https://static.usrfiles.com/ugd/724bd4_9832b9a69ff344a695944c0cf92c468f.pdf
    • https://static.usrfiles.com/ugd/aef5b7_9c2da1d73b7143f1996d489abf58f6b8.pdf
    • https://static.usrfiles.com/ugd/dd4472_36327675da2b4ca4b8a6fb2d48fdd331.pdf
    • https://static.usrfiles.com/ugd/fd3290_8123d6c303e74fe1a0b96f38e374c254.pdf
    • https://static.usrfiles.com/ugd/ace02d_7e124db3d2684d08b7958a28e11b14a0.pdf
    • https://static.usrfiles.com/ugd/c8a981_a4dc33d379de4a73940a3f2f09113b5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e29c1580c904fb5afabe02370fb5898.pdf
    • https://static.usrfiles.com/ugd/cfa91a_e147b5b60ee94934a73b16a90c49bc17.pdf
    • https://static.usrfiles.com/ugd/9e53d4_bf3d7964d3ed479195b9ec17ca9ae894.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/42548075746.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/adam_savage_book.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_off00005fd7.bin
8a1ec39d5fb1f230c4460b65dd8889934fbb320162cc88e08b347a02a5b9ae00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD7 5252 bytes
font_01_sfnt_off000071c3.bin
03a20e2e8123dde2abbb18c99b935ef65296309d70c518606af6919b38579153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C3 10188 bytes

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