Malicious PDF — malware analysis report

Static analysis result for SHA-256 743cd60da548812a…

MALICIOUS

PDF

43.3 KB Created: 2020-08-14 12:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbbdb59e536496bb7a99ca8b20680499 SHA-1: a094b65b8bad89137b0623a995cfa6aa0d14b72c SHA-256: 743cd60da548812ad8b23a0e6492cb2c83c9db63ca1927c6e1763ef7fad00b0d
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure for a 'balance checkbook excel template' and a call-to-action button, directing users to click a link. This link, https://ttraff.ru/pify?keyword=balance+checkbook+excel+template, is identified as a known malicious redirector. The presence of a large number of external PDF links suggests a link farm used for SEO poisoning or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • 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/pify?keyword=balance+checkbook+excel+template
    • http://files.ccocciboutique.com/uploads/1/3/0/8/130813314/dutokab.pdf
    • http://lupik.nostalgictreasures.com/uploads/1/3/1/1/131164250/09d3cc84f.pdf
    • http://vewulex.ausneaks.com/uploads/1/3/1/1/131164250/924b14b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vojinanekarab.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/lagometokovizopan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/vujamorexibexizetugepiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/funejuxujudabasilonali.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/5382488174.pdf
    • https://cdn.shopify.com/s/files/1/0430/4214/4407/files/6764374695.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/63144098154.pdf
    • https://cdn.shopify.com/s/files/1/0435/4061/1226/files/40298484153.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/tujobemujumet.pdf
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/articulaciones_del_hombro.pdf
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/dla_form_2500.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/26424973890.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_off000063c5.bin
b82f045e7df17b8576e74abb37ae6356d27bfece5bcaa3a65b442a5c74d35f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C5 5220 bytes
font_01_sfnt_off00007557.bin
bdb9f9884fe2d6677c86cddc3981148cb7774fd5c4931115a714cb0d48f50209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7557 13728 bytes

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