Malicious PDF — malware analysis report

Static analysis result for SHA-256 635782b830e61a4b…

MALICIOUS

PDF

39.3 KB Created: 2020-08-10 14:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88a313904861cf88b7daa783dc45e5c7 SHA-1: cc03e1c536a1458c947cff10d6f740952d670ad5 SHA-256: 635782b830e61a4bf5e3ac6dc657d7eb50f1c5560a64fcfa23b507b2bb57e79e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, https://ttraff.ru/pify?keyword=carnival+of+venice+trumpet+solo+sheet+music+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to trick users into clicking it. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or malicious redirection attempt.

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=carnival+of+venice+trumpet+solo+sheet+music+pdf
    • http://files.liftyourlifewithlaura.com/uploads/1/3/1/6/131636941/4155094.pdf
    • http://gigadeb.qualityfoodvi.com/uploads/1/3/1/3/131380600/vupaj.pdf
    • http://nutoged.bakerycreationsbykeri.com/uploads/1/3/0/7/130739561/d0ff11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7096/3366/files/17249940644.pdf
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/7797089440.pdf
    • https://cdn.shopify.com/s/files/1/0435/5362/0136/files/strategic_management_in_public_administration.pdf
    • https://cdn.shopify.com/s/files/1/0437/7912/9501/files/wafowakoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/degozetavuwizipelebulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/barron_s_essential_words_for_the_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0437/7234/6526/files/zufalef.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/gibebuvudomodaketerumes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7861/files/visa_on_arrival_form_thailand_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1513/files/can_you_annotate_a_in_onenote.pdf
    • https://cdn.shopify.com/s/files/1/0433/6415/5560/files/algebra_ebook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7710/7865/files/beatles_piano_sheet.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000467e.bin
f3b1ffbd6d60cffeaf23dcca66aff82fded0602150a635ecf23cb8664977e302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x467E 5360 bytes
font_01_sfnt_off0000588d.bin
8f7e8c930cdad38d234294f191288cd8d9d6effc985a6156cfe1268bc18042e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x588D 9424 bytes
font_02_sfnt_off0000791a.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791A 16120 bytes

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