Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fdc10b713ea3e7…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 20:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9cd6382f46be7425c5b5851c3b66cae SHA-1: d41ebf5bf6d3ba7d0b4ebf36343d728039389e4a SHA-256: 33fdc10b713ea3e78aa49d8a5e5e04ceabffa65cde02324d8c21bb2e796e312f
154 Risk Score

Malware Insights

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

The PDF contains a link farm and redirects to a malicious URL, identified as a redirector. The document body, though heavily obfuscated, contains the target URL and references to other PDF files, suggesting a lure to download further content. The ML classifier strongly indicates maliciousness.

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=conjunction+junction+lyrics+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/8de238_b068109f282a4be7b26757553e66d6ba.pdf
    • https://static.usrfiles.com/ugd/ca300b_6295f23527b64b6db3faca05058579c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_21746769b7df4ad4b972569c2d0c0613.pdf
    • https://static.usrfiles.com/ugd/253000_90f5fe958084442e86ecdf974d7a23fa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/the_emerald_tablets_of_thoth_the_atlantean_doreal.pdf
    • https://static.usrfiles.com/ugd/234f58_ec5567fbe14645eab1117917edee68cd.pdf
    • https://static.usrfiles.com/ugd/8ab72e_1fe039afaf274aa2b01adcf69893349a.pdf
    • https://static.usrfiles.com/ugd/ea2f88_d0b62bdd87204ee096c5d0a331837669.pdf
    • https://static.usrfiles.com/ugd/a771bd_f211971dd03f4754a4750af0933a0c38.pdf
    • https://static.usrfiles.com/ugd/b8c837_82978ccb474743e383af397d10f35d19.pdf
    • https://static.usrfiles.com/ugd/b8c837_00746bb3e7cd49f19d7059be2d01271d.pdf
    • https://static.usrfiles.com/ugd/516793_086cce742d4844bebd14497ae433dcc8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000652d.bin
d97efddbcfc670dc45b1d34485e508e449aff589a839da8a1af0427616c7f383
pdf-font-stream PDF embedded font (sfnt) at offset 0x652D 4904 bytes
font_01_sfnt_off000075f0.bin
6735b8d56026f0987a886c2054edda2b29736106bbfba18acc85065681b8003c
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F0 9916 bytes
font_02_sfnt_off000097f7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x97F7 4324 bytes