Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c0894b84bd2e99…

MALICIOUS

PDF

47.1 KB Created: 2020-09-02 15:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 052dde30cf8ace553c9f7b7ca5ade1c1 SHA-1: f64eab83febb0d9228373eb5911a2f4f51ecc6bf SHA-256: 17c0894b84bd2e99c27cf7429d1affaa0e34d24d18b6c8a1e37a259d0060d489
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains text related to job applications and URLs pointing to a link farm. This suggests a phishing attempt to redirect users to malicious content.

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.com/wix?keyword=barnes+and+noble+job+application+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/soal_asking_and_giving_opinion.pdf
    • https://cdn.shopify.com/s/files/1/0438/6678/3899/files/89388860440.pdf
    • https://cdn.shopify.com/s/files/1/0464/7855/7352/files/m_e_officer_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8239/9390/files/apple_app_store_for_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/fetasavamaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/22462159523.pdf
    • https://static.usrfiles.com/ugd/b8c837_b107720b1cf5421ab279440d713f8153.pdf
    • https://static.usrfiles.com/ugd/185811_a7e30135a1c546ddb6bb3d79c21b0cac.pdf
    • https://static.usrfiles.com/ugd/a86d68_afe3530e0409442ab178d9ffff7f9020.pdf
    • https://static.usrfiles.com/ugd/2b25b5_765202c13ae449779e29f85e638aa00a.pdf
    • https://static.usrfiles.com/ugd/5899d5_0433e42b56df4cc893dfc53a56ce58c0.pdf
    • https://static.usrfiles.com/ugd/9e14ca_7f337bb1260048fc9aa9dbdce6e9a490.pdf
    • https://static.usrfiles.com/ugd/105a8c_d09bcdb6c5a04f33bdd0475d5edea64b.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_off00007887.bin
7803cd343a5f0331bb54bf8f8142e736a412ebff5647d95fd422214905715a5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7887 5416 bytes
font_01_sfnt_off00008afc.bin
9f692ef949411fda53403ef92de90dc311206c280521025c42cc4208284a570b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFC 10684 bytes