Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b37a581040b4e21…

MALICIOUS

PDF

41.3 KB Created: 2020-08-20 04:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b13f126a08d86b8f1b5cfd594724842a SHA-1: 805827a469945e00e527b25e1ffb0bdf11cb75ed SHA-256: 2b37a581040b4e21cf9dad4915a5e6ecb98a6796835d2b49c49a978a546aa757
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.cc', suggest an attempt to redirect users to potentially harmful content. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links, including a malicious redirector, is the primary indicator of malicious intent.

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=expression+vs+equation+worksheet
    • http://files.missinginamericaproductions.net/uploads/1/3/0/8/130813736/gigadujuleg.pdf
    • http://files.tdforus.com/uploads/1/3/1/3/131398366/pibupileba.pdf
    • http://files.eviesoriginalsartnwearables.com/uploads/1/3/1/4/131454699/4543928.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/20353116438.pdf
    • https://cdn.shopify.com/s/files/1/0433/2067/2409/files/giguwafitibed.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/98186788058.pdf
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/82108959903.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/93481042850.pdf
    • https://cdn.shopify.com/s/files/1/0448/9995/8939/files/magic_item_table.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/27660984136.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/nasumupoje.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0087/files/blockly_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/9358/9142/files/wobukuxijatuvupoxu.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_off00006127.bin
d3d0703253d3333969a5e00b055f31a9a8969a278426947764b5e5822be302f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6127 5244 bytes
font_01_sfnt_off00007317.bin
38934eacc5a177434443135b4a2fdc71851dd61db106bceb248e648c4f967114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7317 11080 bytes

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