Malicious PDF — malware analysis report

Static analysis result for SHA-256 020c34b9efabd483…

MALICIOUS

PDF

41.9 KB Created: 2020-08-14 20:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b87ce6f5ffc31427d6ad586849ae56b SHA-1: 9eab9cf8a86e1e1dbba93831b2cf9b6944c95a45 SHA-256: 020c34b9efabd4831b52ca9db6b10c6a577d8b27460471fc60abb4e5158e2e84
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be generated by wkhtmltopdf, a tool often used to create PDF documents from web content. The presence of numerous Shopify-hosted PDF links, many of which are benign, suggests an attempt to blend malicious links with legitimate ones in a link farm strategy. The primary malicious URL is the most critical IOC.

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=abaissement+cryoscopique+formule
    • http://wuxigo.natascha-wagner.com/uploads/1/3/0/7/130739561/kodidejuziwuf-biwolov-webitir-fixalad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/85335249449.pdf
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/71230947282.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/74635894021.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0791/files/14763338834.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/maworevudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/jodofabupigifetufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/job_application_cv_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/vixajogana.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8932/files/13047067608.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/jirokimofosuwotefep.pdf
    • https://cdn.shopify.com/s/files/1/0433/8699/4855/files/.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/google_chrome_latest_version_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/39395060371.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/core_banking_system_architecture.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_off0000655f.bin
be38e5cf9242665605a79182f36e47336fe4a9509ceb2182bb9cb5e982eda3e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655F 5516 bytes
font_01_sfnt_off0000780d.bin
c1f6dc1421de18fcc65327f7407dd98d4ba42e067229ca254d54bcfb89f2ce78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780D 10036 bytes

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