Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b6a0c7b559b3ae…

MALICIOUS

PDF

59.9 KB Created: 2020-08-12 07:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffcf6840fbf6a4d5733f85fd2ac9a055 SHA-1: 2058319ec6f7c61a814ebfea54efe8718c913a57 SHA-256: 70b6a0c7b559b3ae24a5b72ca900abed653c58b9bb914d2cdc0aa1dd6a461e4a
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, also contains the same malicious URL and numerous other URLs hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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=control%20chart%20constants%20pdf
    • http://files.marozniashop.com/uploads/1/3/2/7/132710748/3743781.pdf
    • http://files.iokokanoa.com/uploads/1/3/1/4/131406985/mexidiz_zuxomidafuxo_dopaxotezozi.pdf
    • http://daxekufej.operationrv.com/uploads/1/3/0/9/130969723/52fc9fe10e6.pdf
    • http://files.ottercoffeevergas.com/uploads/1/3/2/6/132696146/9549970.pdf
    • http://files.absolutealphacm.com/uploads/1/3/1/3/131380175/nataduxov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5383/4649/files/70651131918.pdf
    • https://cdn.shopify.com/s/files/1/0434/4309/3660/files/24392033594.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/dum_dum_girls_coming_down.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/mazekefekuvekuteronu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/90051064147.pdf
    • https://cdn.shopify.com/s/files/1/0441/2211/2152/files/amelie_piano_noten_fr_anfnger.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97072231683.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/93985840055.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1143/files/steal_characterization_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/nuduzekudifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/rance_vi_walkthrough.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_off00008c0c.bin
85ddf7d5a7d7518178b51f2f7fdf497c68da34cfcbd231bedae441a5f1d872ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0C 5148 bytes
font_01_sfnt_off00009d7a.bin
355dfd404119143a4909e576ae6dbcf816877775cd52ad348f38dc2a4d8b83e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7A 15632 bytes
font_02_sfnt_off0000cd65.bin
ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 16060 bytes

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