Malicious PDF — malware analysis report

Static analysis result for SHA-256 6259c2e41ba1eb16…

MALICIOUS

PDF

33.5 KB Created: 2020-08-07 17:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4184ff2eeb2d39935efac32ccdc4d491 SHA-1: 89a734352356996ccf62f52f6b1b7553bb83af93 SHA-256: 6259c2e41ba1eb167470255b150f3a02acf4410f7f27ecfb2b64ad126a30915a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to sheet music and the PDF's creation tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity.

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=pure+imagination+sheet+music+piano+pdf
    • http://files.valeriesplayhouse.com/uploads/1/3/1/3/131381031/3313784.pdf
    • http://files.mynewonline.store/uploads/1/3/0/8/130874322/tetavutizepefu-disogasufuz-bamafos.pdf
    • http://files.andrewrkoenings.com/uploads/1/3/0/7/130739081/9727578.pdf
    • http://files.dillooni.com/uploads/1/3/0/8/130813768/8667782.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0843/4077/files/bujosaxuporonoxopusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/linitidaxusujen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/latumimofujutotiteme.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/bearing_housing_tolerances_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/doditigot.pdf
    • https://cdn.shopify.com/s/files/1/0440/2708/4965/files/82753689687.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/vipajobuwonizowalofedude.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/autodesk_inventor_2020_3d.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/biblia_de_estudio_macarthur_en.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/ages_and_stages_questionnaire_8_months.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/pemofulunisiwakiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/71481632410.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_off00004555.bin
063b3ac4eb9d713a4fc18a2ea50295444aeb172a87d909f10376a66d20493445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4555 5540 bytes
font_01_sfnt_off00005802.bin
bfa2676c5b85e9fa76969bec8f18e68492044292ed9a00812920f0b421471771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5802 9712 bytes

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