Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f4c35605dadb77…

MALICIOUS

PDF

86.3 KB Created: 2020-08-12 10:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa7382a623a05a1b67633da09883dc2d SHA-1: 11433660e07bd04684a468312c4e84df2788f07e SHA-256: 14f4c35605dadb7744130b047ec98b323fc0695463b64b22e77e34ec8a965d63
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, many hosted on Shopify, suggesting an attempt to manipulate search engine rankings and drive traffic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=romanticism+poems+pdf'. The document body, though heavily obfuscated, contains this URL, indicating a likely lure for users seeking content. The presence of embedded URLs and the ML classifier's high confidence further support a malicious classification.

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.com/pify?keyword=romanticism+poems+pdf
    • http://gemajo.talesoftomorrowcomics.com/uploads/1/3/1/4/131453870/7926775.pdf
    • http://files.vccrc.com/uploads/1/3/2/6/132682607/nuderexaz_dason.pdf
    • http://files.gimmethelodown.com/uploads/1/3/0/7/130738993/8dd6dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/66594967994.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2093/files/basic_java_programming_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0446/1743/3251/files/windows_server_administration_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9866/files/catch_22_joseph_heller.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0377/files/65197927543.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/the_bluffer_s_guide_to_etiquette_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/5306/9974/files/the_very_hungry_caterpillar_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9417/files/3_digit_addition_with_regrouping_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/javoxanivijab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/nikesukivuwivowiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/vuzagunaledibibegap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/gebesujovalokagewudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/nubonep.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_off000117be.bin
4d298973261dc56fc6abf0279ee7c62b9d67fb01d4948982462244ee6f4e90fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 5180 bytes
font_01_sfnt_off0001294b.bin
8567f54a5fdd6610d1b387e027fd798a847473422ebc647efd1fc387b8051233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 10300 bytes

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