Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76c85c656cfc4c6…

MALICIOUS

PDF

46.7 KB Created: 2020-08-14 21:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49f836a068351d14fd3637779a2b12fb SHA-1: bda7eb911e1dcb091505ffb0fe3afaba298526a6 SHA-256: a76c85c656cfc4c680800ab8be30f6e0233f9273051a41a4d99178c368e0ffd4
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains a large number of embedded links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. One of the primary links points to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains references to the target URL, suggesting a lure related to 'catia v5 freestyle tutorial pdf'. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

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=catia%20v5%20freestyle%20tutorial%20pdf
    • http://files.sarasotacountysurplusproperties.com/uploads/1/3/0/7/130739263/pisesawaxupi_furaziguve.pdf
    • http://files.banksfamily2017.com/uploads/1/3/1/8/131871648/4850eb44d.pdf
    • https://cdn.shopify.com/s/files/1/0434/6344/2598/files/gifilejolisiro.pdf
    • https://cdn.shopify.com/s/files/1/0436/7345/2697/files/55272229953.pdf
    • https://cdn.shopify.com/s/files/1/0445/4265/6671/files/accounting_theory_ahmed_riahi_belkaoui.pdf
    • https://cdn.shopify.com/s/files/1/0434/8107/1782/files/40054788036.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/hypoxic_ischemic_encephalopathy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63908687591.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/tibetamatomekefokulodoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/bixisawatidux.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/zodurebovoge.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/castrol_magnatec_professional_e_5w_20.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_off00006f34.bin
90e9a298a11c286a767bee0c7370d9ddc115f2c833ca979abe8d81a973c1fa77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F34 5224 bytes
font_01_sfnt_off0000811b.bin
32249cb91ac6150a07ea334d34db8b0ec682168ef2117ddb45c1581762a7e345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811B 14512 bytes

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