Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58c7489bc6d2f4a…

MALICIOUS

PDF

38.7 KB Created: 2020-09-10 15:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3171e9a68c6d07ba8576fc7c6f4ee9fd SHA-1: 8f2b3e60c9e4b41d1e1dacf659935486397b915f SHA-256: f58c7489bc6d2f4a5b81f04e974ca98e70e3f993b0a408042e2132d31e62e6bd
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'cloud computing interview questions and answers pdf' and the malicious URL itself, suggesting a social engineering lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/pify?keyword=cloud+computing+interview+questions+and+answers+pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/java_8_full_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1567/files/4._2_exercises_algebra_1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/gavuliw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/craft_beer_book.pdf
    • https://static.usrfiles.com/ugd/837d34_9090552417594c8582d4819ab1f24a20.pdf
    • https://static.usrfiles.com/ugd/c1615c_ca2e5133a2e14e748e922863b362ad03.pdf
    • https://static.usrfiles.com/ugd/2813e2_a6aab678b512472b987eb399f5811b77.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/78125022664.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/nakisapigutabitaxusor.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000595e.bin
131422df5baf97be1d5726857961513659e0cafc58ca6ce6256ec9ee32bc9505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x595E 5660 bytes
font_01_sfnt_off00006c90.bin
8d03032f31612e0c851c266a8c504f98a4973eb5377996af801a84fded2368a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C90 9836 bytes

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