Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e2c7e0f8060c88…

MALICIOUS

PDF

46.2 KB Created: 2020-08-14 02:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76a8bc9abc2502d3ee8909c9449f2070 SHA-1: d7ffb7566f24d87bfaa68f151b6975fd50a1d17a SHA-256: 61e2c7e0f8060c880338deb54e2ac3af8ae6471eb0c25eb2b3702f6d95ce1662
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating a link farm. The primary intent appears to be directing users to malicious infrastructure via the 'ttraff.ru' domain.

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=gold+leaf+sheets+makeup
    • http://files.kcolvininteriors.com/uploads/1/3/1/8/131857304/ginexikiwot.pdf
    • http://files.mildredlibrary.com/uploads/1/3/2/7/132740172/foxoxodipopize_xiporonuze_xuninorujabutun.pdf
    • http://files.owsleytilecleaning.com/uploads/1/3/0/7/130775760/8641860.pdf
    • http://files.bristolprivateclients.com/uploads/1/3/1/4/131406288/melukelale_zolovaril.pdf
    • http://files.greathalltheatre.org.uk/uploads/1/3/1/8/131860787/de0b064.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/nemubofafasazilubuxuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/fegaxufudiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1575/6181/files/ximumixuzuwitezuvesuvulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6062/files/advanced_language_practice_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/9938328635.pdf
    • https://cdn.shopify.com/s/files/1/0435/3468/0216/files/vapidezokewixodutowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0553/3604/files/68306962717.pdf
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/mr_robot_god_speech.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/84529418849.pdf
    • https://cdn.shopify.com/s/files/1/0429/8545/5769/files/financial_reporting_meaning_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6467/files/17675598985.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/keranejunezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/68092016651.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_off00007582.bin
bd1a1c37cc42f313a19101bf248101ca8d250a81919993815c84dccab4310d23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7582 5280 bytes
font_01_sfnt_off00008764.bin
f8d38f489f9dbfff151088524b3496baeec7549e41f81066f41c2989791053f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8764 10592 bytes

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