Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe7bcb5eb13ae9d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 08:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 086673488d1cf6e7e57fd6018100d32b SHA-1: 8f88ae91a4652242a945f7383b7eaf0cb82b33a6 SHA-256: afe7bcb5eb13ae9df362cf6897e8b1aff443e88900a30b105343962afafce700
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=foundation+trilogy+kindle'. This URL is presented within the document body, disguised as a book title, to entice users to click. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness.

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.ru/wix?keyword=foundation+trilogy+kindle
    • https://static.usrfiles.com/ugd/0a0016_044443c90c87459892b23ce73ab6e7b6.pdf
    • https://static.usrfiles.com/ugd/856cea_19caed2a58b544a98deb09135a645782.pdf
    • https://static.usrfiles.com/ugd/b8c837_e63621dc43304f2ba6b4accc554dcec6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f084b8f6aab492ba4462969083540fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_07b7e67539e94b319f124c84ebc7e973.pdf
    • https://static.usrfiles.com/ugd/b8c837_c190173c940b48559d2cda89728aa1a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f93452b4e75f4affa44ca5eb0e7cccdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_4256e1a6ffbf4d08a811cea1e5adb1dc.pdf
    • https://cdn.shopify.com/s/files/1/0430/2661/2378/files/44910877965.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/37477297788.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_off00006c28.bin
ae2510b6ea6f21c12f770ffd99d3dc664982c2c3faf7015c9f7a0fc57c78795f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C28 4936 bytes
font_01_sfnt_off00007d0c.bin
9c240d142e3d80da28847137ddc2bbc7d125c5113c52a0a76a8ca0350ac932f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0C 10392 bytes

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