Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f67c805c462eb…

MALICIOUS

PDF

42.2 KB Created: 2020-08-15 01:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b378cd27aa1d78908f723fa905be3cf7 SHA-1: f0d66df4853a48cafb7c479368b8344f1da74fe6 SHA-256: 850f67c805c462eb4c292225379714c27544dc199df45449f480d71f6d370014
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=bkav+pro+crack', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for cracked software, aligning with social engineering tactics. The presence of numerous PDF links, many pointing to benign Shopify domains, suggests a link farm used to obscure the malicious redirector.

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=bkav+pro+crack
    • http://varojuz.emergeinmarketing.co.uk/uploads/1/3/2/3/132303072/gamidudatedimadusulu.pdf
    • http://files.fauxmesticgoddess.com/uploads/1/3/1/8/131856381/gevaxil.pdf
    • http://files.huttvalleysportsawards.co.nz/uploads/1/3/0/7/130739918/nimenomuner.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3277/1750/files/matplotlib_color_maps.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48675385277.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8407/files/rajuxirifurazoxesuwute.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/motemadifex.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/vemasirewakeliketupo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/10483671944.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/337637116.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/17230510256.pdf
    • https://cdn.shopify.com/s/files/1/0431/7514/9719/files/45753864137.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/how_to_make_a_discord_server_active.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_off000061f6.bin
8790e265498aec4e80b0f12f7fc0b8c4b6a27c2cfa6f2a4281e21e0ce616ecbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F6 4892 bytes
font_01_sfnt_off000072b0.bin
4768cee5493b765ea21da87f032d196f2ff866e5a33b7c149becdb6d306e1bd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B0 13152 bytes