Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd69a7837300d26…

MALICIOUS

PDF

49.4 KB Created: 2020-07-29 22:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d565f6989c311bed1acdd1d57d75b244 SHA-1: e472a97e7404206a63351d4f7ccb9f397223f9eb SHA-256: 1bd69a7837300d2609e55fc0535d641c878865759a00d9cfa57a855a524c6f6f
152 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 firing indicating a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'attachment styles'. The presence of a link farm hosted on Shopify, pointing to various PDF files, further supports a malicious redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=4+attachment+styles+pdf
    • http://files.dodgenband.org/uploads/1/3/0/8/130813079/3391489.pdf
    • http://files.hilliardacupuncture.com/uploads/1/3/1/6/131607522/vinelokexilu.pdf
    • http://files.sustainablesubstrates.com/uploads/1/3/1/3/131379591/vazuwulokarag_dugizivetapa_zoxox_dusafo.pdf
    • http://files.saigonapartmentcenter.com/uploads/1/3/1/3/131379183/rakafawujokud.pdf
    • http://files.womensmarchfl.org/uploads/1/3/2/6/132695438/1578586.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/45220977837.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4502/files/13524024285.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/89548527005.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/49168605032.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/ligosorime.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/46642862558.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6970/files/gozufoluwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/pujuguvexo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/siwetusaluv.pdf
    • https://cdn.shopify.com/s/files/1/0439/7511/4910/files/10907469424.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/89950573283.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084d9.bin
930402a9a802c27998db1d21eb0103ed603a6bad7f9b515eb44f30efc01a4df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D9 5024 bytes
font_01_sfnt_off000095d3.bin
faa74f147c7fc8d49d9244fb7aa1e09e4f172a33d751c4f9c69569f10b8612ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D3 10232 bytes

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