Malicious PDF — malware analysis report

Static analysis result for SHA-256 7305a2c05845d69d…

MALICIOUS

PDF

42.6 KB Created: 2020-08-05 18:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76962060cda075e52b937a540b795699 SHA-1: c7b0c0fbf265d797d142fbd902d6cbce846a22de SHA-256: 7305a2c05845d69d99cc4b5836efa3d8d92800c46ddcf540934247c4c263be67
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though partially obfuscated, includes the target URL and suggests a lure related to 'Contexto social libro pdf'. The ML classifier also strongly indicated maliciousness. The presence of many external links, including a link farm, suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=contexto+social+libro+pdf
    • http://files.elizabeth-mendenhall.com/uploads/1/3/1/3/131383825/13a72db332.pdf
    • http://files.renaissanceone.org/uploads/1/3/1/4/131408117/feraratofibulosa.pdf
    • http://files.vancoschool.com/uploads/1/3/0/8/130814588/nafiwif_vatabukavowigeb_giguduzutep_xuxadofulumo.pdf
    • http://files.puremovementdance.com/uploads/1/3/2/8/132814958/4882030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/12736027715.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6502/files/razipasakexeniz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/nodatesurujijesom.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/76475800316.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/genetics_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/4946/8582/files/94647300788.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/kukatexubifemejolufefoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6087/7729/files/ciencia_de_los_materiales_dentales_phillips_completo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/amore_al_tempo_del_colera_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3026/5511/files/gizegedij.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/ethyl_acetoacetate_reactions.pdf
    • https://cdn.shopify.com/s/files/1/0429/0671/4268/files/longman_academic_reading_series_4.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/dugasitesitufotiso.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_off000069b6.bin
4b9e18ee6ad0b202d4e625a963520f48303ba41ae25d7757c7332bea98b2856b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B6 5260 bytes
font_01_sfnt_off00007ba1.bin
884ccb56138c88137e09197383976b0f300afb19e5beef1fdb2f07fe3c813497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA1 10112 bytes

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