Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e74f3142c6ecb2…

MALICIOUS

PDF

32.4 KB Created: 2020-08-14 02:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a530bd50176f1be20c744aa9c4f14e5d SHA-1: 1f5f6d7d51b4a97990f36f368a875018f64eee2c SHA-256: f2e74f3142c6ecb2a49366026ab073efd5b11d8d8943aaee14753453bab11d05
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used to obscure malicious intent. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=connectors+english+grammar+worksheets', which is also flagged as a malicious redirector. This suggests the document's primary purpose is to redirect the user to malicious infrastructure.

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=connectors+english+grammar+worksheets
    • http://vawibu.familyhistoryguy.net/uploads/1/3/0/8/130874493/3741528.pdf
    • http://files.rebeccalynnphotography.net/uploads/1/3/0/8/130874518/4840188.pdf
    • http://files.fexasas.com/uploads/1/3/1/4/131407281/tizomiletofepuxekan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8517/6736/files/67373299114.pdf
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/introduction_to_nanomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0433/3151/8622/files/putowofubelonexokafu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/the_complete_contest_prep_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/gen_brca1_y_brca2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0440/7230/4805/files/how_to_stop_avast_email_signature.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2633/files/sovenodogibefa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/44084386632.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/kikeke.pdf
    • https://cdn.shopify.com/s/files/1/0435/7036/4571/files/calculus_textbook_larson.pdf
    • https://cdn.shopify.com/s/files/1/0439/5941/9038/files/87736863617.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_off00004308.bin
0da765b39a14302102bbafff496d4d076a1a9ae08797c3f9df113e8fbf7e8d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4308 5272 bytes
font_01_sfnt_off000054d5.bin
e374bd4e3c6b73805dc709e6b517d6b159cbbf41027fa333bc46d5a322885006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54D5 9344 bytes

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