Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0dc95bc9f6494e…

MALICIOUS

PDF

37.1 KB Created: 2020-08-21 20:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce578cdc3b26951a3db039a2cf1daf89 SHA-1: 594f590b273cb8612e9ffde45ac4807ac32db64d SHA-256: fc0dc95bc9f6494e5fa1ae4014018ca708c3a9bd3cc87a6b35ad89e2e1f1a45d
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final destination and potentially deliver a malicious payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=how+to++sprint+report+in+jira
    • http://files.jacarandaholisticcare.com/uploads/1/3/2/3/132302710/9af7251d3ba.pdf
    • http://loxabaku.kmoranart.com/uploads/1/3/0/7/130775883/pezesevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/zuratunetozun.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/bimade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/belupuzobigamonafe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/jonapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/91578905933.pdf
    • https://cdn.shopify.com/s/files/1/0437/1457/6537/files/expanding_and_factoring_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/24920795325.pdf
    • https://cdn.shopify.com/s/files/1/0433/9885/6871/files/kerimumixidarotipozewevoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/29227201013.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_off000055f7.bin
b2aedeeeae527b34ce6794c7b2fbd828114c71938ad44f04c3ddf339c258d912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F7 4912 bytes
font_01_sfnt_off000066cc.bin
e941909691e7e127e6707ac2257103ae12645e37154a4344b5093a713465d45d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CC 9684 bytes

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