Malicious PDF — malware analysis report

Static analysis result for SHA-256 826e23054b54de5e…

MALICIOUS

PDF

66.4 KB Created: 2020-08-08 02:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6af0d8a55ebfcb4b235f06be21316999 SHA-1: 19b73a5ee2219a52aa7bfc20d4dde2440c0c0128 SHA-256: 826e23054b54de5efac4c5422207580304fd648d6186b0793d8e967147567902
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'Wagner 590 paint sprayer manual', likely a lure to encourage clicking the malicious link. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wb?keyword=wagner%20590%20paint%20sprayer%20manual
    • http://paguzi.usdinstitute.com/uploads/1/3/1/4/131453109/3205530.pdf
    • http://files.fscmadison.com/uploads/1/3/1/6/131636655/335bf.pdf
    • http://files.257bennettstreet.com/uploads/1/3/1/3/131380158/e2ab03b34d429ca.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1042/3960/files/kupezapawakonid.pdf
    • https://cdn.shopify.com/s/files/1/0428/0378/9991/files/ronanoduxazu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2790/4165/files/cakewalk_ua_25ex_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/1242/9723/files/56893753516.pdf
    • https://cdn.shopify.com/s/files/1/0437/1972/1115/files/45232704135.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suton.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/28756958484.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7702/files/fozorikosil.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/46288138889.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/suzuki_outboard_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/24218417351.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/78939885360.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_off0000b08c.bin
8b69ad8bf8706a8de8604f0485c67fb25a23b24d50174afbb8bbf061f3c53837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB08C 1684 bytes
font_01_sfnt_off0000b8f0.bin
11fecc36376dd7ccded495dd3522f957e8055d98453f7ef47b3d9aa61e480856		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F0 5676 bytes
font_02_sfnt_off0000cc3b.bin
a373ce9f7014991c60aea691b697223e9edd19d65207a242b71a5385f9549162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 15804 bytes

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