Malicious PDF — malware analysis report

Static analysis result for SHA-256 495e2f8d7323bfa9…

MALICIOUS

PDF

33.6 KB Created: 2020-08-15 11:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 918fb9b0ed7799946095d4a6b797fa4a SHA-1: c11b53dfd96bdb2cb470867a99707b80663a80de SHA-256: 495e2f8d7323bfa9aaffe44ae79cd9cde1d554e89abb73b5b3112ab80b2e6a1d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, a technique often used for SEO spam or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=cashflow%20101%20board%20game%20pdf'. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify domains, suggesting an attempt to disguise malicious content within seemingly legitimate file-sharing platforms. The presence of multiple PDF links further supports the 'PDF SEO Link Farm' heuristic.

Heuristics 3

  • 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.
  • 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/wb?keyword=cashflow%20101%20board%20game%20pdf
    • http://files.isis41don.com/uploads/1/3/0/7/130775292/luduviduk.pdf
    • http://ninuleva.1800cuttree.net/uploads/1/3/1/3/131398125/kaxubo_zijifef_wabejirilipaxus.pdf
    • http://files.irishmilersclub.org/uploads/1/3/1/3/131380001/nenudebok_mupowig.pdf
    • http://dugaza.integraled.org/uploads/1/3/1/3/131381679/ruziwaban.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/pdf_to_word_converter_free_download_nitro.pdf
    • https://cdn.shopify.com/s/files/1/0433/6196/0091/files/vidux.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9221/files/noguxazesibozitida.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/25779725219.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/3591680854.pdf
    • https://cdn.shopify.com/s/files/1/0431/3376/3746/files/2969214486.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/fowara.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0437/7831/0295/files/lojozeso.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004345.bin
d71931b3abbf2ff6a902e5077cc7e66854c1f3d48d23c600f860a69035997c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4345 5784 bytes
font_01_sfnt_off000056e0.bin
00c6e78168ce7d63a040ab86041db7bea5e37aeb153dd83758ae1fa7ef0f1985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56E0 10304 bytes

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