Malicious PDF — malware analysis report

Static analysis result for SHA-256 842fc46a1e6a2227…

MALICIOUS

PDF

37.3 KB Created: 2020-08-09 11:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fff757f4c441e419278e69c1fe2f668f SHA-1: 757664863b9919578afceb2dcd6114ff984808ca SHA-256: 842fc46a1e6a2227cfed8bab3f703a241e6f45128605023715452d6ad6c613a4
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the ultimate destination. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm, suggesting a social engineering tactic to trick users into downloading further content. The ML classifier strongly indicates maliciousness, and the presence of a redirector link is a critical finding.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=english+newspaper+pdf+free+download
    • http://files.stevenpbrady.com/uploads/1/3/1/6/131606878/6275963d420c8.pdf
    • http://jexek.gardenstyleonline.com/uploads/1/3/0/8/130874317/jujozalok-vixilabona-fejadewiniwe.pdf
    • http://files.filmaim.com/uploads/1/3/0/7/130740536/saxof_lizedi_joziso_xatiritudi.pdf
    • http://files.crossfitsouthforney.com/uploads/1/3/1/4/131406806/d3d4dde1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1315/0632/files/complete_physics_for_cambridge_secondary_1_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5899/files/teas_test_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xiwisabimetabif.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5249/files/sarujeti.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/unity_blur_shader.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/lojodiluvujugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/41933606375.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/bamukukaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/coraline_graphic_novel_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/zuvofidilavonejo.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_off000053e9.bin
cd393c44be292fbdfdd279fbece943278c33b35084acd5ab090e83a9a99b496d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E9 5352 bytes
font_01_sfnt_off00006630.bin
56a9c8e26038c7b5627158e9fbd455e8d70fcb4e547d89723b15b0697fecdd42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6630 10152 bytes

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