Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafb6550dd2118f4…

MALICIOUS

PDF

49.7 KB Created: 2020-08-30 10:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20ba7d08c056cd1d9f68ae2953971bc7 SHA-1: a7efb12b44208447ba3c315bf477b8554093d354 SHA-256: dafb6550dd2118f4a4301034ab190a58dbaf77fe87dab2145c3f0aa9876e83aa
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.com/wix?keyword=p90x3+eccentric+upper, which is likely used to direct users to a phishing or malware-hosting site. The document body contains garbled text but also includes the same malicious URL and several other PDF links, suggesting a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=p90x3+eccentric+upper
    • https://static.usrfiles.com/ugd/ea5d7b_9132393f3a4b4f38905c8704e3cc07ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_09afb7bc9c834125bc5547bdd4df0aea.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b7f69f54454e3f9f877e93227c4a94.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/semijebebojev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0460/3910/5700/files/chenani_nashri_tunnelway_limited_annual_report.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1340f1607743f594209bed08f197e5.pdf
    • https://static.usrfiles.com/ugd/cdb50c_af5502a2a4cf4ebba6853421360fbacf.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_off000085d9.bin
2bac686064f6f45164dbb5a71b97306851f85430c050fe4e705177278b33f352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D9 5036 bytes
font_01_sfnt_off000096ff.bin
e6116607e02d811385aa88e828baa9e6bce3eda1aa9fed45db7f04170a4803f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96FF 10420 bytes

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