Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda429747527de70…

MALICIOUS

PDF

40.1 KB Created: 2020-08-10 04:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11491dd2f93aedec73e045f1c528ac7c SHA-1: 89de9252645a173ada11a5ce76074d164d07cc2d SHA-256: bda429747527de70fda894ddac58ee94294fb006eaa9641ef0f8010941f3b62e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially garbled, contains the title 'Zestawienie czasów angielskich w tabeli pdf' and the malicious redirector URL, suggesting a lure to a malicious site disguised as a document.

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=zestawienie+czas%25C3%25B3w+angielskich+w+tabeli+pdf
    • http://files.yungschinese.com/uploads/1/3/0/9/130969489/tuzukidefibefodewe.pdf
    • http://files.tarpanmanagers.com/uploads/1/3/1/6/131606396/1568070.pdf
    • http://files.bennettallenwood.com/uploads/1/3/0/8/130874400/bafijepab.pdf
    • http://files.poweroftheflowers.com/uploads/1/3/2/3/132302787/nufopixefugif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7317/files/88278986696.pdf
    • https://cdn.shopify.com/s/files/1/0439/2543/8619/files/bench_vise_parts_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0435/7154/4223/files/alcanos_en_la_vida_cotidiana.pdf
    • https://cdn.shopify.com/s/files/1/0433/9826/7029/files/pink_floyd_pulse.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/71716973283.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/sagivulawenidagetabunad.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9310/files/80272945761.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/92830699496.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/24298976059.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_off00005993.bin
92923440e93a9fd21a1a74297e68f2e885b6beb91c4d03a64fd542f5d1d7420b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5993 5760 bytes
font_01_sfnt_off00006d06.bin
8b185374782605b2438ef7cae89566111786727e4c1878eacb27851c1e8e6103
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D06 11676 bytes