Malicious PDF — malware analysis report

Static analysis result for SHA-256 056a7160256cb4b9…

MALICIOUS

PDF

39.3 KB Created: 2020-08-11 15:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4374f376b3accae9f03c9f7fdcf26ac4 SHA-1: e9386a64775eb0e6770b3a3d865d6bb3a056b2c6 SHA-256: 056a7160256cb4b962da023ab82109e7144cee272525194eebc880225fefac89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically the URL https://ttraff.ru/pify?keyword=hoy+et+al+mathematics+for+economics+pdf. This heuristic, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a tactic to disguise malicious links within a seemingly legitimate document.

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=hoy+et+al+mathematics+for+economics+pdf
    • http://files.vargislab.com/uploads/1/3/1/4/131437445/livenoxu_dagaxowila_redejod_fujiti.pdf
    • http://files.trailffest.co.uk/uploads/1/3/0/9/130969456/052c6c13a.pdf
    • http://files.lomtheater.org/uploads/1/3/0/7/130740323/1589cb70e79aacc.pdf
    • http://files.philjeremypersonaltraining.com/uploads/1/3/1/4/131406114/c5d5983e5c3fe5.pdf
    • http://semupebug.realabstractart.com/uploads/1/3/0/9/130969352/0f6c55da4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/74058113098.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/disexolaniwekejevubiko.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/siwive.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/boravujuxevepixosopa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/76198355274.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/antihistamines_for_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/86879787982.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/danavuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/tugakezavogakoxatatajo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0757/files/murenisixidawojejonov.pdf
    • https://cdn.shopify.com/s/files/1/0437/7516/4574/files/jalujizikalatebufu.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_off00005a4a.bin
32e3d6b306a04ee4b0e9c625782440860f946c7e11fa350c16246ac3dca26c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4A 5456 bytes
font_01_sfnt_off00006cb2.bin
a1d4787447f5ad3498962cfda85687760b6faf7117c6d5dd605582877e3d3a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB2 10428 bytes

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