Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16bf1c825d01159…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 20:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3c5621057a77c82534809993fb5a0b0 SHA-1: a103a05f03d9e687b72494a4732ef9fad2381b04 SHA-256: e16bf1c825d01159693a6e958401d87822b5452d6e36450565091f4df52c2516
150 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous PDF files hosted on Shopify, with one primary link pointing to a known malicious redirector. This suggests a social engineering attempt to lure users into clicking through to potentially malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=cryer+international+criminal+law+pdf
    • http://files.rafikibiblestudy.org/uploads/1/3/2/6/132681625/48f73736d7f.pdf
    • http://xotixota.jenningsrn-to-bsn.com/uploads/1/3/1/3/131380485/b3f924400a326.pdf
    • http://files.olibarnewrochelle.com/uploads/1/3/2/6/132695568/f99f0cd9d31.pdf
    • https://cdn.shopify.com/s/files/1/0437/2296/5160/files/allluia_le_seigneur_rgne_partition.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/11109376406.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2738/files/adenocarcinoma_de_prostata_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0437/8404/4705/files/stardew_valley_ghost_sounds.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/61131082743.pdf
    • https://cdn.shopify.com/s/files/1/0433/2565/3160/files/list_of_statistical_tests_and_when_to_use_them.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/govin.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/99793287489.pdf
    • https://cdn.shopify.com/s/files/1/0436/2082/7300/files/54971820460.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/56799849584.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/63268962874.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2504/files/82870950542.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_off000061dd.bin
571487d4a0cfbf9f57c155f436ddd0bcb05f30c4972b7c853ae24f9eb3189cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DD 5220 bytes
font_01_sfnt_off000073a4.bin
e37a18bb4316bc1aa72bf934d5b5808851d8ab36249808875127b3084ce7dd3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A4 10648 bytes

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