Malicious PDF — malware analysis report

Static analysis result for SHA-256 1769ecd6a1455ba8…

MALICIOUS

PDF

44.6 KB Created: 2020-08-04 02:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e93cfe7e41e7e4998ecf0c178bce879 SHA-1: 7c5e5d3c265370167bf7dee65f3fb2f606511c59 SHA-256: 1769ecd6a1455ba880e88c333180a4816604591468983151692adabdb8f7c0d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to malicious content. The document body, though heavily obfuscated, contains text related to PDF conversion and the malicious URL, reinforcing the lure.

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.ru/pify?keyword=best+pdf+to+word+i+love+pdf
    • http://files.nc-zeitgeist-foundation.org/uploads/1/3/1/1/131163635/8774186.pdf
    • http://ketaz.bodypaint-nederland.nl/uploads/1/3/1/8/131871871/safudurisidu.pdf
    • http://files.ronyah-arts.com/uploads/1/3/0/7/130776823/xunosalew.pdf
    • http://files.thefootrailstore.com/uploads/1/3/1/4/131452878/3550964.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9157/4430/files/43186978334.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwunojipodaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/14275248272.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/lovazi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/69352832486.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/xolafagaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1461/files/arthur_schopenhauer_pessimism.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/67175611806.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/dutekasarexukoloruwijomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/firefox_change_download_location.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_off0000711a.bin
e9ea54bb3ac37ef84185e2284168f00851602c2ef396c6f1c1ed99c29d149d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x711A 5028 bytes
font_01_sfnt_off00008261.bin
a467bc258d6013aebdda7831d04552e84d69819b058b7472020698d524b8198d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8261 10392 bytes