Malicious PDF — malware analysis report

Static analysis result for SHA-256 c623de5f6400eb37…

MALICIOUS

PDF

38.1 KB Created: 2020-08-10 07:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b554a93cf9a2072afe06f5e04955e5b SHA-1: 29f6da3a22a7fdc5de9d689db9d642eeda7ab07a SHA-256: c623de5f6400eb376e44ba7b0474e536930aa2f5b086381a566677374be5dd38
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates a malicious redirector link, specifically 'https://ttraff.ru/pify?keyword=cahier+de+vacances+ce1+pdf', which is designed to lure users to malicious infrastructure. The document body text, though partially corrupted, contains the phrase 'Cahier de vacances ce1 pdf', suggesting a lure for educational materials. The presence of numerous Shopify-hosted PDF links, while many are benign, contributes to the overall SEO link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=cahier+de+vacances+ce1+pdf
    • http://files.plainjane614.com/uploads/1/3/1/3/131379591/tuzisifobukedegogu.pdf
    • http://files.apeforge.com/uploads/1/3/0/7/130739504/d788a6183c0.pdf
    • http://files.prek-12resources.com/uploads/1/3/1/6/131606118/xerekekeje_gezos.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/relowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/101_aviones_de_papel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0220/files/85910113558.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/tevanigumomitunopom.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/88577864408.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/55365872144.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/cat_330_specification.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/61914052496.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/99116553250.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8838/files/melesolezimuvoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/2633/3351/files/nosumaginirita.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_off0000536f.bin
42fe7155d6ed64541cf9cfee745d9df9f9f9a1b3fb645e1947aeee1ea0d80904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x536F 5228 bytes
font_01_sfnt_off0000653b.bin
6e4e172f71fb989dbc8d886c7fe2f380bcbace76b965aa6cea1e9c5f795af705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653B 11648 bytes

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