Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57f08dcb91a6872…

MALICIOUS

PDF

58.2 KB Created: 2020-08-05 03:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec1056d0366d480defe523054e33f06 SHA-1: 58d393ee6487456b89b7332c8cf5dbec7c7f0394 SHA-256: d57f08dcb91a68722cf5f46d4d0a921868b286ef8f0e1cd0e6c07df9d4ee4a74
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL "https://ttraff.cc/pify?keyword=liquid+rocket+engine+combustion+instability+pdf", which is a known malicious redirector. The PDF also hosts a large number of links to other PDFs on Shopify domains, likely for SEO poisoning or to appear legitimate. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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=liquid+rocket+engine+combustion+instability+pdf
    • http://files.auroraonfrance.com/uploads/1/3/2/7/132712185/fogafip-kodiv-jolafurexiba-naguresoginiw.pdf
    • http://files.tac-tx.com/uploads/1/3/2/6/132682039/1539121.pdf
    • http://files.allisonbellucci.com/uploads/1/3/0/9/130969652/dukenimovud-sunewiwagax-ginarazodesuzut-fopodoxujoxudo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/23637413661.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/wetuzubunowiwubuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9611/files/56584143200.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6428/files/89025417002.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/tufejimamowexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/73327206593.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/conjure_volley_5e.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/kopifalalajefinugig.pdf
    • https://cdn.shopify.com/s/files/1/0449/9865/6158/files/minutos_a_horas.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/zanifofezuwokiririx.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.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_off00008d59.bin
4ced9ad31bf9c0888b6579d56f0ae59ca82b985b4d40ee6ee1bf6497b835138c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D59 5848 bytes
font_01_sfnt_off0000a137.bin
0ed9d1f69d777e1d294d142edff20d701ff4cd5ac8617ceed25d479cca995e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA137 10940 bytes
font_02_sfnt_off0000c6d0.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 16060 bytes

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