Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb324d181f961931…

MALICIOUS

PDF

51.2 KB Created: 2020-08-08 16:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d402d4fdaa53808592d3ccdd36a2646e SHA-1: 5fee80e2ee54fa829b4772c361d30d1fbfab87d9 SHA-256: cb324d181f9619312998dc6c3b54885de101f9e7fd1182bade02c1951a31cccf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector, which is a common technique for delivering malicious payloads. The document body, though heavily obfuscated, contains the URL that leads to the redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to manipulate search engine results to lure victims.

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.cc/pify?keyword=belgium+visa+application+form+for+short+stay+pdf
    • http://files.dawnfeeneyjewellery.co.uk/uploads/1/3/2/7/132740378/kenoretefura-pexaburivixu.pdf
    • http://vumagal.hillcountrycommunicators.org/uploads/1/3/1/6/131606027/neliwapazasukadixodo.pdf
    • http://files.infinitywellnessconnection.com/uploads/1/3/0/7/130775025/tomewigijokitu.pdf
    • http://files.richardgmont.com/uploads/1/3/2/6/132695351/9385219.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/gumif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/detoxification_of_xenobiotics.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/42706183414.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/raised_eyebrow_ascii.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/stop_youtube_from_pausing.pdf
    • https://cdn.shopify.com/s/files/1/0436/3278/7609/files/kozatiziza.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/16427359449.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/prueba_carbono_14.pdf
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/bls_instructor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9553/9368/files/80027625969.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/9439456275.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4986/files/xanavezugasile.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/dabejafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8847/files/20243685203.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6951/files/jugojadejikojuvusekizudu.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_off000088aa.bin
1de5ede490ce3c384f1f23e62ae4374cd9f032f3ec0891508839f88986a5430c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AA 5780 bytes
font_01_sfnt_off00009c44.bin
38452feeb1f4e748ff7f9255445f7857b60143947550f97a29aebe5ea13aa89c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C44 10144 bytes

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