Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b839c8be6bd77b0…

MALICIOUS

PDF

51.5 KB Created: 2020-08-06 12:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b1c5722233efabdcc49284de54fb65a SHA-1: b164ddd48ab971dfc2c30cd704cffb1f8afd8afe SHA-256: 8b839c8be6bd77b02d9d314acfc16e54558f1ad2f518c5218444177b22359117
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=curso+de+ingles+pdf+gratis', which is identified as a malicious redirector. This suggests the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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/pify?keyword=curso+de+ingles+pdf+gratis
    • http://files.openheartyogastudio.com/uploads/1/3/2/3/132302992/gulefajetida.pdf
    • http://files.nanasrecyclables.com/uploads/1/3/1/3/131380138/fijatusigalev.pdf
    • http://togun.jewishucb.com/uploads/1/3/0/7/130776483/3474674.pdf
    • http://files.a1homestay.com/uploads/1/3/1/4/131437410/6451355.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/nirewevotejevif.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/86870540094.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/mipubegisokomog.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/vezexabuxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/5464491122.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/7041380916.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/49008285721.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/74978959354.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/30125765425.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/alp_psychological_aptitude_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/pufarozex.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/7908184976.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/gents_shirt_cutting_pattern.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_off00008813.bin
acba72dd7556cff8da0c1ecad6f5ecd90eba8161d2c8d132bb833c0a4319baa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8813 5112 bytes
font_01_sfnt_off00009984.bin
eaa6407f7bb9e6ebc693d90ee42bf8bd4983b85d381d526d8a965e6b076e26c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9984 11672 bytes

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