Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cadecb382c1a3b8…

MALICIOUS

PDF

35.8 KB Created: 2020-08-06 15:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78d8365eb7868c8a9ca1567254254b90 SHA-1: fc68f8607eb209e87aa59f20c0ab04756ef54203 SHA-256: 5cadecb382c1a3b8aa105548714c443f0f2f73d2a2cdd40ee53ba60c8ede00e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that are part of a link farm, with one critical link redirecting to known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for a PDF download, which is then used to direct the user to the malicious URL. The ML classifier strongly supports the malicious nature of this PDF.

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=building+construction+illustrated+5th+edition+pdf+download
    • http://domapet.gardenincubator.org/uploads/1/3/1/4/131407148/6349234.pdf
    • http://files.bestbroadbandsupplier2019.co.uk/uploads/1/3/1/4/131406507/lubukadim_xiwixojore_buxebudekira.pdf
    • http://files.littlebluebowphotography.com/uploads/1/3/0/7/130775588/raxafuzelarurivex.pdf
    • http://files.theroseonthecake.co.uk/uploads/1/3/1/4/131408256/9477421.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53522836856.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/bobanudasexesapatitom.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/raletapoluzilizujizezareg.pdf
    • https://cdn.shopify.com/s/files/1/0429/1585/6550/files/nijusuvive.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0288/files/67408829192.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8848/files/giwivejataluxosuwibedix.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/mekijufowazinafilewevoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/wow_classic_leatherworking_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8375/files/credit_reference_request.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/luigis_mansion_iso.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4679/files/windows_7_product_key_generator.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a14.bin
a55e12dea9c6034d60421d336aabb198a9560b6246d2da8baa432f0a96163ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A14 5684 bytes
font_01_sfnt_off00005d7d.bin
55ea5a5111aabbed6b28d0cf21d2779b6b8f340606ceb00d8f6f5e60dafc2962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7D 10864 bytes

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