Malicious PDF — malware analysis report

Static analysis result for SHA-256 d815ffd9e0e32020…

MALICIOUS

PDF

55.0 KB Created: 2020-08-05 04:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 220e5e1b17b3899ffe72111d86b2c3c8 SHA-1: a0d8929cde05a4591b5396b8b359c20c2e0d3c21 SHA-256: d815ffd9e0e32020da7d5db3c9b52ae4c31fdb5a384f3d41536170d637b00818
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, leading to a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=kurtz+foundations+of+abstract+mathematics+pdf, which is likely used to obscure the final destination. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains numerous links to external PDFs, suggesting a SEO poisoning or link farm attack.

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=kurtz+foundations+of+abstract+mathematics+pdf
    • http://files.dogodogo.ru/uploads/1/3/1/3/131380495/zumifogekowizute.pdf
    • http://files.loudlibertarian.com/uploads/1/3/1/4/131483830/kopot.pdf
    • http://files.africamadeintheshade.net/uploads/1/3/2/8/132814935/desuzata-wekefakojikow-wonofavodosow-fepivu.pdf
    • http://files.centerassociates.com/uploads/1/3/1/4/131413485/pojuxulikinesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/82723406005.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/47840175401.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/nasoviporegimopidolibef.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/74461643535.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4700/files/butifu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8165/3655/files/nimopane.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/98147188921.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/lizesaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/72424025569.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/fallout_4_weather_commands.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/xefasul.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/rovikogevaborig.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/59231765607.pdf
    • https://cdn.shopify.com/s/files/1/0451/3467/6133/files/additive_utility_function.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_off00008d1d.bin
4b18e65d3c43db31e761edf5d6f138e43c8a0f20517e0c03b286682152941085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1D 5520 bytes
font_01_sfnt_off00009fbc.bin
2d1419103f7baca24c443a0fa032df32a06c37f6d2dc492a48115ae64bf378fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBC 2576 bytes
font_02_sfnt_off0000a979.bin
01486a2d644330d23f775bf0980705c6c7da7ee4202216f4d04fbd0f08360d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA979 10832 bytes

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