Malicious PDF — malware analysis report

Static analysis result for SHA-256 4796fa5d6ff0bfe3…

MALICIOUS

PDF

78.5 KB Created: 2020-08-12 05:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08fab902b4342730d55c82025371235d SHA-1: 3b1959e979268fdc3a222808f953554557725733 SHA-256: 4796fa5d6ff0bfe3ded9bec3c4e285b98d416dd863b5d20452b48afdac47e17f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This indicates a link farm or redirection attack designed to funnel users to malicious content. The ML classifier strongly supports the malicious verdict.

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=joint+stock+company+book+pdf
    • http://files.queridouniverso.com/uploads/1/3/1/3/131381614/1d12eec.pdf
    • http://toretote.theshepherdsacademy.com/uploads/1/3/2/6/132695569/xotimetalafukoneja.pdf
    • http://files.irnawards.co.uk/uploads/1/3/1/3/131380292/noxenirejepat_bisexi.pdf
    • http://files.swallowthesea.com/uploads/1/3/0/7/130775520/sozoxuvaxoxo.pdf
    • http://limipirop.ecoyoga.us/uploads/1/3/1/6/131636954/rixukejuwojoli-fefuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/apollinaire_biographie.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/80077162786.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0433/5520/9879/files/sufuwamuxefotafofani.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/goxefujuno.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/85248715810.pdf
    • https://cdn.shopify.com/s/files/1/0437/0418/9096/files/rugupekot.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/norefavememurawilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/92589897146.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/2016_17_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7717/files/37042271697.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/safibidibim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a4.bin
6a7608b9e453cfe30d7a71db83872425297b9dfdcbfe75094e59ba4a050be408		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 5348 bytes
font_01_sfnt_off0000e6f9.bin
030552ad94119be4e6bd81d0e9946f7f2104e972930dcbbe9624a3aac31fd045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5468 bytes
font_02_sfnt_off0000f98b.bin
6bcfd21f1fcc2ad88a761142d562d5709787956b50424f82906c55e6518cfa0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 15932 bytes

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