Malicious PDF — malware analysis report

Static analysis result for SHA-256 989d10fc5fc6dc21…

MALICIOUS

PDF

40.7 KB Created: 2020-08-14 08:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c225cafdf38f3730cc5aea282552289e SHA-1: 695723b431aeb7de46d9bb4eb2c197022ec1c78f SHA-256: 989d10fc5fc6dc21cfa2a445a1dafe58c0dd9acf6b4a47baba46a7c6f97a6975
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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.com/wb?keyword=norma%20iso%209001%20version%202008%20pdf%20icontec
    • http://files.carolcabrera.com/uploads/1/3/0/9/130969809/jerovitu.pdf
    • http://files.oakbaychoir.com/uploads/1/3/1/4/131438011/3398108.pdf
    • http://milekurib.mega-marine.co/uploads/1/3/2/3/132302780/funufujenujid_dotofolo_gojovet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/50354981773.pdf
    • https://cdn.shopify.com/s/files/1/0437/6985/6158/files/6193397805.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/61428532265.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/82591500813.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/wuwebotoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/gukakulelofeda.pdf
    • https://cdn.shopify.com/s/files/1/0429/5032/8486/files/psd_to_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3932/files/fluke_87_true_rms_multimeter.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/31306108474.pdf
    • https://cdn.shopify.com/s/files/1/0435/3985/7563/files/49741945474.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/st._augustine_confessions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/50243466801.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_off00005cc5.bin
c280f6d5b1b79e25a9df6f9e8ef4219c4a28e460231192c18674b32e6c722ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC5 5976 bytes
font_01_sfnt_off00007105.bin
5fcbd50e2d52bd01c99b9e5e152e71c6c58adf3353b2096b91aa1799b0b28098		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7105 10808 bytes

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