Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2a6c69cb5c9aaa…

MALICIOUS

PDF

45.8 KB Created: 2020-08-16 17:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a1540f8b49fba41e2a9e8f34c65691 SHA-1: f113e169fcac50c901d9ce2887f2b24b8ef9ebcf SHA-256: 7c2a6c69cb5c9aaaeea7817389b6b6496b5423be4e189803a1898ac637060299
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://ttraff.ru/pify?keyword=daily+mail+crossword+answers', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files, reinforcing the lure of providing answers or content. The ML classifier also 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.ru/pify?keyword=daily+mail+crossword+answers
    • http://files.eastendspecialplayers.org/uploads/1/3/0/9/130969192/bojokimokusejo_gaguxiriza_wapitore.pdf
    • http://files.renewedbyfaithmissionretreat.com/uploads/1/3/1/8/131856518/gazawa.pdf
    • http://files.indianaregion.org/uploads/1/3/0/7/130775897/8900363.pdf
    • http://dapun.comfortablehomes.com/uploads/1/3/0/9/130969242/lowulabuzafef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8374/0822/files/tasilunuveviwolipazupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/vubowume.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8744/files/sims_3_update.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/snell_y_bohlander_administracion_de_recursos_humanos.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/functional_text_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5516/files/year_calendar_template_2013.pdf
    • https://cdn.shopify.com/s/files/1/0429/5943/7975/files/thor_2_putlockers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/unholy_death_knight_talents.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/nozolinet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/gubudezidufevozerob.pdf
    • https://cdn.shopify.com/s/files/1/0444/3232/6823/files/nurikajufoxuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/71317508807.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_off000074f1.bin
1a740cdf21b90f23434f9770a31553be1f030a409a81431bb4a77cc6e01d58a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F1 5276 bytes
font_01_sfnt_off000086d8.bin
a737e36e8f92857c3edc6cef1092ed8df89fb3a43dfb125c6ee8555ad6fc2171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D8 10340 bytes

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