Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de9ab7e89c290e4…

MALICIOUS

PDF

45.8 KB Created: 2020-08-19 00:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b6120311a5bb7bde3ec002a1aedec9a SHA-1: 80d6da0ee4b0c6c71fb59a573a723f9438fd56be SHA-256: 5de9ab7e89c290e4329dd1c6e7e0659cb0431b49a579e58b2865781553b7c21b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'live sound engineering books pdf'. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. The ML classifier 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.cc/pify?keyword=live+sound+engineering+books+pdf
    • http://files.rapidrealestatevideo.com/uploads/1/3/0/7/130775950/lavopijakitam-lusifedujetowa-wijasedisofu.pdf
    • http://bipatoxuk.oliosmarket.com/uploads/1/3/1/6/131606739/ed218c3417c.pdf
    • http://files.bayareajunkhauling.com/uploads/1/3/0/7/130739697/ganoxaxiner-wegerab-govivek-delirokime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4273/4229/files/41633131185.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/renaissance_architecture_in_italy.pdf
    • https://cdn.shopify.com/s/files/1/0440/4497/6278/files/34019791464.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/pegedibi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/92323220634.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1972/files/gusevalurilugesikudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8535/6449/files/88853512256.pdf
    • https://cdn.shopify.com/s/files/1/0454/2903/1070/files/bgcse_mathematics_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8406/files/1641234717.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8313/files/29494353246.pdf
    • https://cdn.shopify.com/s/files/1/0438/2241/6029/files/introduction_to_human_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7805/files/66126342028.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_off0000761e.bin
1fb8556ee6b2ec6644825e388ac6dd7988959f849b43ba4771263329be74d8a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761E 5172 bytes
font_01_sfnt_off000087cc.bin
ef029ad67f2c81780139c113afbe9bb9edfca1558af39498bdec51bde1ff3453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CC 9996 bytes

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