Malicious PDF — malware analysis report

Static analysis result for SHA-256 9475694de64b17d4…

MALICIOUS

PDF

59.1 KB Created: 2020-08-06 12:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32fa2afbca4a5f40a2e963173b5510db SHA-1: 5fd0830b3de70cc5699cbf75f1212860a04f78a6 SHA-256: 9475694de64b17d49dc7d51e12f781506daae83fb02c5043a697c20a0cf303fd
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a SEO link farm, aiming to attract users searching for specific content. The ML classifier strongly flagged this PDF as malicious. The primary attack vector is a phishing lure using a seemingly innocuous document to redirect users to a malicious site.

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=frozen+let+it+go+lyrics+pdf+download
    • http://files.centerformarxisteducation.org/uploads/1/3/1/6/131636651/rebisodafakota-rokabidewi-bojolipizes.pdf
    • http://files.trinalang.com/uploads/1/3/0/7/130738806/6770477.pdf
    • http://files.anusaindigenous.com/uploads/1/3/0/8/130874474/6696737.pdf
    • http://files.zhishuaizhang.com/uploads/1/3/0/7/130775868/8b51431.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/1760/8090/files/psychrometric_chart_si_units_high_temperature.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/burujovuwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/fudujaxoluxupow.pdf
    • https://cdn.shopify.com/s/files/1/0437/6012/4061/files/58546301411.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/lawavar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0437/7831/0306/files/xisibazufotobowovafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4691/1643/files/convert_zip_code_to_latitude_longitude.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/46297922552.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3920/files/78959144665.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/jofozifibamasuxokilemex.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_off000086b6.bin
f8195a27e871a39ccf0f5a29c58ddae5eae87936bea81f5087e56f3ea519fe18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B6 5524 bytes
font_01_sfnt_off000099b7.bin
d9f515d0bcab7b3661061b1a8079a895025b2a0faf64ef6a21dc9dfd94cbd0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B7 15088 bytes
font_02_sfnt_off0000c960.bin
2bbab8e0ab70e0c99170dc5ad395c70f1ceb4d1c659183c267c07d9dd3c1dca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 16328 bytes

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