Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f48b44587a4dab4…

MALICIOUS

PDF

41.3 KB Created: 2020-09-02 10:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b0af810b642f7e5ae920ecff3f5efb SHA-1: dda69000041609a1293f6d2a925134ade5b4f987 SHA-256: 3f48b44587a4dab48e2a2dda5a6bb91554966f0c76cc6ee5e302f602e574ec9f
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=offcat+analyzer+tool, which is flagged as malicious. This suggests the document's primary purpose is to redirect the user to a harmful site, likely for phishing or malware distribution.

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=offcat+analyzer+tool
    • https://static.usrfiles.com/ugd/837d34_aea25fd889b5411da591115adc18d967.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e04610e10ff46a4b195ffd7d0581162.pdf
    • https://static.usrfiles.com/ugd/191a6d_2bbeac128a3142909792845231573a13.pdf
    • https://static.usrfiles.com/ugd/c5d40f_aa41b307bf4441b4b7ffff9f63a6bbfc.pdf
    • https://static.usrfiles.com/ugd/83e24f_ae0222fc900646ccb8ec29bd76a94da1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8132269b2054bcd8464b320a2d9008d.pdf
    • https://cdn.shopify.com/s/files/1/0436/1191/4403/files/naruto_blazing_apk_mod_2._6._1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30106301206.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/tijugelukelo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/80650261188.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/xapijud.pdf
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/xokazes.pdf
    • https://cdn.shopify.com/s/files/1/0435/3441/8072/files/gemagerelolejexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/32878748960.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005678.bin
02201fdaf2752f4422f7629c71039e5f766ffabbddac837aa70011d2fb945b01
pdf-font-stream PDF embedded font (sfnt) at offset 0x5678 2828 bytes
font_01_sfnt_off00006082.bin
7e102094f6059f3b5bc0bb74e37f8f385d54263d82ff4848f906fbe9c6df655d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6082 4876 bytes
font_02_sfnt_off0000713b.bin
3663ec1f14d5f7c67c6fceca8b7c95b960998cc2cdca08a2b281ac342f6f8610
pdf-font-stream PDF embedded font (sfnt) at offset 0x713B 12136 bytes