Malicious PDF — malware analysis report

Static analysis result for SHA-256 121db761f2e25535…

MALICIOUS

PDF

44.4 KB Created: 2020-08-31 08:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8999fcd2eadf593c7653b698d155695 SHA-1: e5d120de36c0a3838639864d0be953c0c5775421 SHA-256: 121db761f2e2553560c8f360cd5ba597f2cd6337b0cc297c07a1f95061d49fe3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be an instruction manual, suggesting a lure. The presence of a malicious redirector and a large number of external links indicates an attempt to direct users to potentially harmful 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.cc/wix?keyword=vision+spinner+instruction+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/39cb9d_90a6e26738b640e9b712cd021d3ce87a.pdf
    • https://static.usrfiles.com/ugd/b8c837_65107c90225148b7ab58151f91e311ad.pdf
    • https://static.usrfiles.com/ugd/d63aaf_1fe4b8939bcc40e09ed93a4f73ceb9e1.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/lenejunif.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/android_studio_3._3_3._4.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/talk_yourself_into_it.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/weider_ultimate_body_works_exercises_chart.pdf
    • https://static.usrfiles.com/ugd/f0e51d_1681eae1994c4dcfbbde9b7d6bfb5db2.pdf
    • https://static.usrfiles.com/ugd/3bcfef_a38fac527c6a436799cba43973f5f8d6.pdf
    • https://static.usrfiles.com/ugd/89363e_013386086339448199459433796608b9.pdf
    • https://static.usrfiles.com/ugd/c345b0_e84795ed097c42debf4b34de9129970c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e02755ea7f64cb2ba3cd4a7f15fa134.pdf
    • https://static.usrfiles.com/ugd/1c90dc_77eb13bd8e174f249ad4e89c8b7c6cea.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fad1ec8506d492aa393b8ba15f0c18a.pdf
    • https://static.usrfiles.com/ugd/39cb9d_e4fe51087bfb49e3998ff9d421aad812.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_off00007030.bin
0ff40ff929af7d2b95d1b3fddb640672d542cb3802e1826d18f80e39b467d5ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7030 5044 bytes
font_01_sfnt_off00008139.bin
1c5706ea3d11caede441c3b3df1f53310c698ab88054586055eaa20b54dd8ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8139 10288 bytes