Malicious PDF — malware analysis report

Static analysis result for SHA-256 75be3991b6c3d746…

MALICIOUS

PDF

38.9 KB Created: 2020-09-02 22:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49f6155cb71ee2b96615425e1d798271 SHA-1: afb9fa545440b7ecd0b94ebb6cee7aaf8c5e6c34 SHA-256: 75be3991b6c3d746f028ae14a5fbb84eeaecbf4f20194a4b20d1e72675db0192
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, disguised as a 'Top Boy' parents guide. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of the malicious URL strongly indicate a phishing or redirection attempt. The ML classifier also flagged this PDF with high confidence.

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.me/wix?keyword=top+boy+imdb+parents+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a4d998_e7f121fce58a44d0aabf10814e3f44b4.pdf
    • https://static.usrfiles.com/ugd/d5415a_5ea2ae2fbc6a41118f14e987c0dfea74.pdf
    • https://static.usrfiles.com/ugd/cc14e4_6c630eaf03b54a3dbd7938748edbffdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_1318525437d04026a36bb8fd533469f4.pdf
    • https://static.usrfiles.com/ugd/850f07_8a6f80b5400e4c1dab47c83f7de927be.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0d15a98e73a46568002f219140aba0e.pdf
    • https://static.usrfiles.com/ugd/83f04e_5c2b0e8a3ce2429eb164cf4c23a1b5b0.pdf
    • https://cdn.shopify.com/s/files/1/0435/2235/9447/files/how_to_filter_in_sas_enterprise_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6933/3916/files/star_behavioral_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8128/5286/files/pajun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.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_off00005a9c.bin
1f490dcb30e349c426c362b763f1ceac2a3af89ad218387744cb5e67c5bab711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9C 5436 bytes
font_01_sfnt_off00006d03.bin
ff667beab164b578edc53b75cb3386c0f90d6e7be76826ad261a3ec9f8c357a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D03 10076 bytes

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