Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bf317958f64a56…

MALICIOUS

PDF

40.2 KB Created: 2020-09-01 12:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad618525e47f1207c0c45f40244f87e8 SHA-1: 0449d7fe610168e0f540babc47c9c5078eaabd0e SHA-256: 09bf317958f64a56dc66bc02e687e90abc42b0452d087692cc62643bb6bb1338
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, suggesting a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bunbury+police+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/2064/8352/files/23439898832.pdf
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/75529073276.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0936/files/megoduvu.pdf
    • https://cdn.shopify.com/s/files/1/0457/5297/5516/files/jeweponulufegawolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0356/7515/files/mutual_non-_disclosure_agreement_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/vusufivebovanejul.pdf
    • https://cdn.shopify.com/s/files/1/0453/9387/1016/files/wumajamanufikijakufa.pdf
    • https://static.usrfiles.com/ugd/20d83a_03942c55c26a4aa99405b4fe4b501345.pdf
    • https://static.usrfiles.com/ugd/0789d5_37a62475b3e54e49b379fe6d36491d85.pdf
    • https://static.usrfiles.com/ugd/314c35_1fc02bb9103c48cdb36a1ddbe19beaac.pdf
    • https://static.usrfiles.com/ugd/c5d40f_2816b7839b484bb3ba997927db7e4dd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c6160b6537646af81d48374e8119561.pdf
    • https://static.usrfiles.com/ugd/c0fca2_17c78ac2946d4741b8e0cd1e86f5b615.pdf
    • https://static.usrfiles.com/ugd/df4650_b1cd360428bd4993ab70543998839357.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_off00005ea7.bin
c6ad97068448ac0fe4faac32ff548fe55b58bb07dce26113a939044c4406e1ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA7 4832 bytes
font_01_sfnt_off00006f2f.bin
5c6d09b71eee716eb84f7ecba3e934af0311e8a29b8c1d558f5e56464c01c530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2F 10908 bytes

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