Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e8e1c2546dd853…

MALICIOUS

PDF

47.4 KB Created: 2020-08-14 21:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 672466f3a12c12187f549490c162a6a2 SHA-1: 2f230ba25e987b798278791d327c8ee23855e86e SHA-256: 61e8e1c2546dd8538444c42119cadc8beb3a678712d8c8a8443f4d9e00d33757
154 Risk Score

Malware Insights

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

The PDF file contains a lure related to PC build guides and embeds a large number of links, including one to a known malicious redirector. The ML classifier strongly indicated maliciousness. The embedded links likely serve to distribute malware or lead to phishing sites, disguised as helpful resources.

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.com/pify?keyword=best+pc+build+guide+2018
    • http://files.raredragons.shop/uploads/1/3/1/4/131452935/e8d8fef3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/90289247061.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/afl_finals_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/vokaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1512/files/79016611832.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/xakaguwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8910/7869/files/kufebejusesukev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/16684646294.pdf
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/ranoz.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_off00007945.bin
c3e25acd96ed7900533258c7e797e5f77bd6840019e11942ef7aedf849faf71d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7945 5644 bytes
font_01_sfnt_off00008c8d.bin
e56ef3276a6428cfdf0df32ed6c1de78e5cd4d95c4cbd09ab0c65099cf279e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8D 10616 bytes

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