Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f42d1ef613a9562…

MALICIOUS

PDF

52.8 KB Created: 2020-08-04 10:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d659adba3fa2ce6ab96186d97050a0 SHA-1: 7f064cfb5729018b4f4eb0884d960a5311a2c9bb SHA-256: 5f42d1ef613a9562662ff072013f180aaa9ac452c0d2346c36f4f2d6f163d9f8
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 Shopify domains, but one critical link directs to a known malicious redirector. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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=understanding+the+linux+kernel+free+pdf
    • http://files.skipelmore.com/uploads/1/3/1/3/131379590/dibujum.pdf
    • http://files.claytoncompounding.com.au/uploads/1/3/0/7/130775644/fazawoso_musibimo.pdf
    • http://files.morganmanella.com/uploads/1/3/1/8/131857442/duxawazojesiba.pdf
    • http://files.thesuitcasejunket.com/uploads/1/3/0/9/130969506/2159389.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/nukepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/xebuluta.pdf
    • https://cdn.shopify.com/s/files/1/0438/2624/9885/files/akon_lonely_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/subphylum_hexapoda_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/xusepod.pdf
    • https://cdn.shopify.com/s/files/1/0437/1703/4134/files/jezikadivojuwativexom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73807437975.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4882/files/gizelewo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/mufoseterekabojovibubovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4466/6529/files/10499368799.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6852/files/baxadobixolatuwemamax.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_off00008ed5.bin
51729b70d03295f8c24ccc159b15d5da81fca5f7c18889d006ad06a831dd361b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED5 5424 bytes
font_01_sfnt_off0000a14d.bin
161681fc8ddd1ef62368653a234a9f636445d75f522264bffa70a639898367d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA14D 10944 bytes