Malicious PDF — malware analysis report

Static analysis result for SHA-256 76373e35ccdfc947…

MALICIOUS

PDF

61.0 KB Created: 2020-07-31 03:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166cce81d8601bd14924f601554ae5b5 SHA-1: eb29fac22de83322c5e3a137c646a2be753909c9 SHA-256: 76373e35ccdfc94710718d9ae25992bee15587dcf75c41ec0d4a077d1d9f41d0
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many pointing to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests an attempt to direct users to malicious content or phishing sites.

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/wb?keyword=verbos%20regulares%20e%20irregulares%20em%20ingl%C3%AAs%20pdf
    • http://files.blnetworking.net/uploads/1/3/1/4/131437671/nagivenexodisi.pdf
    • http://files.millomrufc.com/uploads/1/3/1/4/131454496/2ac9c0daa57b0b.pdf
    • http://files.fromposhtoohmygosh.com/uploads/1/3/1/6/131607600/4757013.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/xavetewuxemawanamijo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/wuximabibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/59798946664.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdf
    • https://cdn.shopify.com/s/files/1/0433/9718/5701/files/danasinibopexosela.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/muratozofoxudenatularilex.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/favaxesef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/fisavalimer.pdf
    • https://cdn.shopify.com/s/files/1/0438/6357/2635/files/laxirumudajojumetedekesam.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d01.bin
fa79b5761c69a5fcdc1e7b2cf4f6392370bb671bee615dab7c27579f8c4f86f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D01 5416 bytes
font_01_sfnt_off00009f08.bin
1fa3dabe1f91fb48ad3ce2454dff1311fe6f10d07c107efdb5c58fe86140fd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F08 16560 bytes
font_02_sfnt_off0000ce54.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16312 bytes

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