Malicious PDF — malware analysis report

Static analysis result for SHA-256 3488720457c19448…

MALICIOUS

PDF

38.2 KB Created: 2020-08-15 14:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 875c039bd65e26033703a746860f4975 SHA-1: 94e50cf52f2190fbbe4f55b146c59e2ef2faedda SHA-256: 3488720457c19448aa5945e7d87bc1e2ff14ac51f87167a52ade6071ca7a1a2f
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.ru/wb?keyword=science%20book%207th%20grade%20pdf`. This indicates a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains references to the same URLs, reinforcing the malicious intent.

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=science%20book%207th%20grade%20pdf
    • http://files.bajarallyschool.com/uploads/1/3/2/6/132682883/mumerorebuza.pdf
    • http://files.alchemyls.com/uploads/1/3/1/8/131856330/3a81265e.pdf
    • https://cdn.shopify.com/s/files/1/0434/5813/4168/files/36168706848.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/18145733843.pdf
    • https://cdn.shopify.com/s/files/1/0434/5741/3270/files/femuzisuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46605756913.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/55802405075.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/fofusirexixojadutevilunir.pdf
    • https://cdn.shopify.com/s/files/1/0432/9675/1771/files/felupu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/modifiers_tinkers_construct.pdf
    • https://cdn.shopify.com/s/files/1/0447/6259/5477/files/spurious_correlations_tyler_vigen.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/64773062918.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/
    • https://cdn.shopify.com/s/files/1/043

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000575f.bin
672c00ae6b30e58b79c7063f5a62a176b88e976a4f5f4ca91f0a02ed7877b2ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x575F 5592 bytes
font_01_sfnt_off00006a59.bin
0f11fb081079b425e7005e60fa8505c7a4ec5c6d2e15adc6c18c2d7c4afe80f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A59 9936 bytes

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