Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a087628dd695f2b…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 14:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2752b22d6275c30e77356adb7a082e8f SHA-1: aad1c4246e57a6a9c17b5355799a5dc86e1eb316 SHA-256: 9a087628dd695f2b576237c7d2ee16b6cf13d6b3d339aa1ab769ddbbe0f01f71
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to lure the user to a malicious site. The document body contains text that appears to be a title and authoring information, likely intended to make the PDF seem legitimate.

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=family+theories+an+introduction+4th
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/rebiwu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/accounting_and_finance_terms.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/monoprice_select_mini_v2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6981/6478/files/new_line_in_jasper_report.pdf
    • https://cdn.shopify.com/s/files/1/0465/3291/9446/files/zuxemuxigofuniwofedupib.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbbfd0603f3e4887bbdb92b5c4ab1d31.pdf
    • https://static.usrfiles.com/ugd/2b25b5_98b6277bb75b4b1a813fa9be57b2664b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ee590db22b0406ab72ad62683a0418b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f45ee15d0da44aeeae51d85a94ec3e0b.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/gefumu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8236/files/android_device_manager_for_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/vomunetavalixatojezupowip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/fibaxexakam.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ef5f099d7c24892b17015a034fc3c0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f71b5057ffa44e138626de63a8734e41.pdf
    • https://static.usrfiles.com/ugd/b58d21_7361a56f98e24d0bada06aafd77c6c13.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_off00005652.bin
5bdeb24df7a60a648aae745a050d4478707bb91d6c53c59790e96d1f76db8f9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5652 5324 bytes
font_01_sfnt_off0000684b.bin
626acee34f1f4ff40ce92d66b412fc3b76d70efc31602c964a74e5d782878266
pdf-font-stream PDF embedded font (sfnt) at offset 0x684B 9748 bytes