Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68d7afc8c221f55…

MALICIOUS

PDF

50.2 KB Created: 2020-08-24 20:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2571fdba9959b9af7346ede3778eedaa SHA-1: 2eec4a618e54b1c9576f207b5ad152c31f546c27 SHA-256: b68d7afc8c221f55692d02455c78d8fbf091d9d31be7778e1d53b5bf2cd825c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=fishing+reports+san+diego+saltwater`. It also exhibits characteristics of a PDF link farm, with numerous links pointing to Shopify-hosted PDFs. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to a potentially harmful 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.cc/pify?keyword=fishing+reports+san+diego+saltwater
    • http://files.octhouse.com/uploads/1/3/1/3/131381288/zutesikapo.pdf
    • http://files.buynorthernlightswines.com/uploads/1/3/1/3/131378942/16f5fc462.pdf
    • http://witer.richmondhillnaturopath.com/uploads/1/3/1/4/131407408/8543d5.pdf
    • http://wegavab.fusetheatercompany.com/uploads/1/3/0/7/130775934/lifaxawikugavopobum.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/84000412481.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6141/files/mavexikejedop.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/ganidamedasat.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/gesto_financeira_pessoal.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2536/files/excel_bedingte_formatierung_komplette_zeile_einfrben.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/19101926471.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/84695312973.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/82393380614.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/9934223493.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/cluster_computing_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/pdf_antropologia_forense.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/black_and_white_converter.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/butterball_electric_fryer_xl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0447/7501/4566/files/20909889635.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085a7.bin
07852dabbafbdc94fde2e238c1f503e7547570304e2b97974bb82df594d22fac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A7 5268 bytes
font_01_sfnt_off00009790.bin
3b2c9edafb0d9af4cc4831538e5cf7ef7525469ce57c1343127d9c253ec80750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9790 10524 bytes

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