Malicious PDF — malware analysis report

Static analysis result for SHA-256 02881f16e8efd949…

MALICIOUS

PDF

40.0 KB Created: 2020-08-29 11:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d32af4124095af2abc58bb26fa2bf2 SHA-1: 5b5cae67a6bff8c2443791aa2196d05f2d0692d6 SHA-256: 02881f16e8efd9490cf7bf85f9c9348ead8a4615cfe96e3943536c9084c634ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links indicates a link farm or redirection strategy.

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=donald+wheres+your+trousers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_4ab9fea6b2844dde98454f9542b0f382.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0f4b80d85d444b39ac73b639e11c68e.pdf
    • https://static.usrfiles.com/ugd/b8c837_78d6fa8d79c14cc48711ea3eae8d0953.pdf
    • https://static.usrfiles.com/ugd/b8c837_965d4ac1c6cf4d2bb972178a5b4a47c2.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/mexexugejaxaliru.pdf
    • https://cdn.shopify.com/s/files/1/0432/4121/0024/files/95043893693.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/kirojifidazubujene.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1112/files/difference_between_inductive_and_deductive_method_of_teaching.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec5cedd48e114c2493038d81e44ebfea.pdf
    • https://static.usrfiles.com/ugd/b8c837_37dda59325b84745b1f6d33c61e9f468.pdf
    • https://static.usrfiles.com/ugd/b8c837_b798244337974331a7ca0fb43a6ad61f.pdf
    • https://static.usrfiles.com/ugd/b8c837_452f2e1ddcde48aba838434085234935.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2b7ad57c16844b7aa4a5a192e0c8564.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f9d.bin
6e8a5865ac47e251c707aa733e53826c6ddb2a6026e9da31ee41514983697041
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9D 5108 bytes
font_01_sfnt_off00007103.bin
500abc99f00fe03af5a13917117fc8a8f12141b2224c6d429de0f3d8690a7948
pdf-font-stream PDF embedded font (sfnt) at offset 0x7103 10140 bytes