Malicious PDF — malware analysis report

Static analysis result for SHA-256 7101a5a8bbfe9a66…

MALICIOUS

PDF

57.6 KB Created: 2020-08-06 23:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77aacb68e175533d44e8cd2dd49d9b0b SHA-1: a2e895307cdf2a533d92a00cccf5671dbe06aaa9 SHA-256: 7101a5a8bbfe9a66c352cee76445e04f6b7cc63b75ee6eb6b889e3bcc142b7fb
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 of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is https://ttraff.ru/pify?keyword=multilevel+association+rule+mining+pdf, which is likely used to distribute further malicious content or phish for credentials. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning tactic.

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=multilevel+association+rule+mining+pdf
    • http://files.diybuilds.ca/uploads/1/3/1/4/131483337/dukugo.pdf
    • http://files.ekamniearth.com/uploads/1/3/2/7/132740275/19f337f04c42.pdf
    • http://files.davideagle.ca/uploads/1/3/2/7/132712093/xejinurubutem.pdf
    • http://files.lonestarcarpetcare.com/uploads/1/3/1/4/131453247/483786.pdf
    • http://files.antoinegindt.com/uploads/1/3/0/8/130814298/6571663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/33461014206.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/6th_pay_commission_full_report.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/zogapuvexik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/83046082967.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/29615897486.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/8786409371.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/advice_on_products_and_services.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/96856261478.pdf
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/apple_genius_training_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1590/files/71049846607.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/38598994085.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/nituritakosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/gegeg.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_off0000a3c9.bin
bdccc7eea08507a1a4105c9c5de3cb02bf0757e4ce0489904e2e5b6bd66e9630		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C9 5540 bytes
font_01_sfnt_off0000b69f.bin
a330f815f79b86bd706a3d707b72f5bf0c4b7c5c0d7d4604377d118e976311e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB69F 10236 bytes

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