Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f39341e4702842…

MALICIOUS

PDF

59.6 KB Created: 2020-08-04 01:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d302ed087579557778af7ae183188477 SHA-1: 57763a40c38c33565554095590e4e8b22bddc3e0 SHA-256: 81f39341e4702842a636d8390ca37a7ea3a6841264e93ff1cfe14c6703ec0b57
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=appendicite+aigue+pdf+2020'. The document body also contains this URL and other links to PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=appendicite+aigue+pdf+2020
    • http://files.harveystringteaching.com/uploads/1/3/0/7/130775561/fevazijivofukilug.pdf
    • http://files.scqhaqueen.com/uploads/1/3/1/4/131482997/9211b29c54.pdf
    • http://files.5degreespsychotherapy.com/uploads/1/3/0/7/130739004/5077372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/vuwiborasobajebowiba.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/7495933264.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/fekulimokatutanaguj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/xevirewivesigatokuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/fozibexan.pdf
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/getting_to_yes_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/mabura.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5646/files/58733691863.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/jobukasolegaba.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/57441563918.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_off000085de.bin
d031fbb9611487d00270175c3ea5a46ff95d2591f39fb03d3b24bf45d7c4862d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85DE 5280 bytes
font_01_sfnt_off000097f4.bin
4ab1c263e55236bd7bd820293f8fa45ccc3c44dd60d894732524dced8e1bee23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97F4 16772 bytes
font_02_sfnt_off0000c9d4.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 16204 bytes

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