Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c85f31b9d563499…

MALICIOUS

PDF

35.8 KB Created: 2020-08-11 05:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4883b1774ddb43c69e200193d52ce2d SHA-1: 5bcc3abe78ef3229d9a03f2604d14aea0baa7135 SHA-256: 7c85f31b9d563499114e7e4ba5e40343b3cc538ab2f47b5fbfe9e9c09c965b3a
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=regional+anesthesia+book+pdf'. Another heuristic indicates a PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf'. The document body, though heavily obfuscated, also contains these URLs, suggesting the primary intent is to redirect users 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=regional+anesthesia+book+pdf
    • http://files.wildeaboutexploring.com/uploads/1/3/1/4/131407135/80581.pdf
    • http://files.grandeprairierugby.com/uploads/1/3/1/4/131406412/vufiluxakezej.pdf
    • http://files.taiwan-america.org/uploads/1/3/1/4/131454466/862401.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/integrated_resistors_and_capacitors_in_vlsi_design.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/67071709256.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/9466753762.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/caldwell_luc_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/48439018955.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/79176934935.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/33421419640.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/kuwuzimad.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/71227009996.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1721/files/mivikurejesifawufarawod.pdf
    • https://cdn.shopify.com/s/files/1/0439/5896/0286/files/variable_expressions.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_off00004bf6.bin
30d9516b876de9ac62152124f272d581935b5587df35c2e9af5e0dfab9ce2c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF6 5420 bytes
font_01_sfnt_off00005e61.bin
883e736de559ebd5266cbd670c3c90102950449fac4a421a64a25533020a7e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 10656 bytes

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