Malicious PDF — malware analysis report

Static analysis result for SHA-256 562858fa1c0e0b02…

MALICIOUS

PDF

45.2 KB Created: 2020-08-08 12:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9dd17a574246c4191382110297d77d6 SHA-1: 0b460ea7f8c7bfb21b8f0eb9df791170527f37b2 SHA-256: 562858fa1c0e0b0245f750de3422230e42f622d241571509976c4e0b8f9ba32c
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 Shopify domains but are likely part of a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is designed to redirect users to further malicious content. The document body, though heavily obfuscated, contains the same malicious URL, indicating an intent to drive traffic to potentially harmful sites.

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.cc/pify?keyword=learn+american+english+online+pdf
    • http://files.mrkellymathclass.com/uploads/1/3/1/1/131164112/ce3fd.pdf
    • http://files.trnwestchester.org/uploads/1/3/1/3/131379700/remabaravuf.pdf
    • http://files.craftedcasesnc.com/uploads/1/3/1/4/131437005/0782f.pdf
    • https://cdn.shopify.com/s/files/1/0436/1050/5379/files/bias_variance_decomposition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/jawipikaroxuvix.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/a320_cockpit_layout.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/panoxanejedifavewe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/galivumizunisaluwida.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/35435195120.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/warerisomovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/30993323177.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/a_catechism_of_christian_doctrine.pdf
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/chemistry_placement_test_practice.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/33893059252.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_off0000718c.bin
89237f09dd5a839f29b45eaf47e89e9b5eca758d22490f455de5346c2bc5cd5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718C 5508 bytes
font_01_sfnt_off00008420.bin
93d4bc2836e533dc7fe4bc46ed7bca6c5b107d2bf524cd7152db62f3e51aea8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8420 10548 bytes

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