Malicious PDF — malware analysis report

Static analysis result for SHA-256 82528caa8863704e…

MALICIOUS

PDF

46.8 KB Created: 2020-08-30 04:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1491c7b46e5ca9070f244a5d6996b02 SHA-1: e5bbd9b952a63791f2af24ee7db7ab671fadb246 SHA-256: 82528caa8863704e29a3a5959018bb0f126e7f76e7e387497d11a4612c4d0059
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=%25C3%25B6%25C4%259Frenme+psikolojisi+klasik+ko%25C5%259Fullanm'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly indicated maliciousness. These factors suggest the primary purpose is to redirect users to a malicious destination.

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=%25C3%25B6%25C4%259Frenme+psikolojisi+klasik+ko%25C5%259Fullanm
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/pemobezav.pdf
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/bitdefender_gravityzone_ova.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/63672718497.pdf
    • https://static.usrfiles.com/ugd/b8c837_5862d2c5c5884edd852281edacd75649.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a29f9951aea4dab93983de1681721be.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8298549005b4d39998f7f2e7733af31.pdf
    • https://static.usrfiles.com/ugd/b8c837_c265cd2fa5f0446194ee900fe6a96c6b.pdf
    • https://static.usrfiles.com/ugd/4b7290_817e8afa6822423db0f5bd9ecdfbde5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_932a3e4dac5f4f908cf08eeffd8b4eb4.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/
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/bitdefender_gravityzone_ova

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007584.bin
529e5244356bf5a12725e6cb539d712f5c6eb09d9dda3370cd2f9443947bd8bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7584 5640 bytes
font_01_sfnt_off00008825.bin
eb997f0a1aae1bbee6b863179a10e5b81beebc970af07c5262b135c19f5fb548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8825 11836 bytes

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