Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17c2feb823072a1…

MALICIOUS

PDF

45.0 KB Created: 2020-09-02 18:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332884d6248eab683f76640df7d4d42d SHA-1: 5dafe65d0bbe9850bb1bc78d6ade8fb23794e886 SHA-256: c17c2feb823072a15a69bf82bfa42b8548c0b16fbcd85ad217a5ae851766e7c6
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=guideline+pulmonary+hypertension+esc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which lead to 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The presence of these elements suggests the document is designed to lure users to malicious infrastructure.

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=guideline+pulmonary+hypertension+esc
    • https://static.usrfiles.com/ugd/c70c35_46231db612c4425ab8489b69e333d388.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_ca7c3cf6cb6141c9a3c932f4486654e5.pdf
    • https://static.usrfiles.com/ugd/eaf48f_b7b24bba86b7441fa0056b43db1235a3.pdf
    • https://static.usrfiles.com/ugd/850f07_910fa2e3793c4319915c975dcc92097f.pdf
    • https://static.usrfiles.com/ugd/f3cb45_108ffb5ba341496bacdfc021894888e5.pdf
    • https://static.usrfiles.com/ugd/eda9ba_7cc6e142a3504561ab91565aa6d5b018.pdf
    • https://static.usrfiles.com/ugd/b8c837_25f721a07d224e1392216c32a96e24b1.pdf
    • https://static.usrfiles.com/ugd/61804c_c7d87024661840b3b1062973fbb46371.pdf
    • https://static.usrfiles.com/ugd/45e30f_46c2aa9601254632972b7382baa2ccb8.pdf
    • https://static.usrfiles.com/ugd/205ae4_95e3de73df9f460f975f8723eec144ea.pdf
    • https://static.usrfiles.com/ugd/9734e7_c238eca88a104f3ea182e8fde22aa4fd.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/basel_2_norms.pdf
    • https://cdn.shopify.com/s/files/1/0459/9339/4338/files/92745889693.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/81058595933.pdf
    • https://medlineplus.gov/pulmonaryhypertension.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006445.bin
7f9033f21ab35d7577adffb632222436afa7b5e51298e36a9e483bb99ca27314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6445 5328 bytes
font_01_sfnt_off0000762f.bin
fb062db096b77d6df95df2381ba0653370405b18e80da2e26697545d689dad4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762F 10144 bytes
font_02_sfnt_off000098da.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98DA 4324 bytes

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