Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1c4ac79ee12566…

MALICIOUS

PDF

54.4 KB Created: 2020-08-02 17:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d73982f87755b712e21b6d084fa901a8 SHA-1: 5946f0002526b04f50aef3f305277a54f68601ee SHA-256: da1c4ac79ee12566af7e4a7d74afbdf779e583bc58f2f065dfa43687d9dd1536
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating that many of these links point to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a redirector suggests an attempt to obscure the final malicious payload or landing page, likely for phishing or malware distribution.

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/pify?keyword=%25D1%2581+%25D0%25B4%25D0%25BD%25D0%25B5%25D0%25BC+%25D1%2580%25D0%25BE%25D0%25B6%25D0%25B4%25D0%25B5%25D0%25BD%25D0%25B8%25D1%258F+%25D0%25B2+%25D0%25BF%25D1%2580%25D0%25BE%25D0%25B7%25D0%25B5
    • http://files.vivagreb.com/uploads/1/3/1/6/131637034/kimab-sugala.pdf
    • http://files.atlanticcoastproductions.com/uploads/1/3/0/8/130813710/wemovererobeg_rukokitejotemer_kanamivezireg_dinuwutap.pdf
    • http://files.artisanteahut.com/uploads/1/3/0/8/130874110/penesuvuwesatof_pudimepuxodi_xawatokuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/supaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1302/1607/files/zutetawodoniruvaju.pdf
    • https://cdn.shopify.com/s/files/1/0429/2257/3990/files/kogomiximuwerug.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/16102254479.pdf
    • https://cdn.shopify.com/s/files/1/0439/1154/4987/files/60628483962.pdf
    • https://cdn.shopify.com/s/files/1/0437/6887/3112/files/gusoremifi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/liwebuvifitet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5638/1597/files/selinazipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/powasigogid.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/patient_sign_in_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/51214838441.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/vojazen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/nenijitugasiwuwox.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008de8.bin
04132a795c42ba1bdd3def148cd349ebe4109d6d1ba1aff6769c5fbb2886cb57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE8 5436 bytes
font_01_sfnt_off00009fb2.bin
1f5fd994b1e2881a35c5ab7f1bb73b017bf4a205587b315aa895ff955b36f9df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB2 13368 bytes

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