Malicious PDF — malware analysis report

Static analysis result for SHA-256 6841dae4898ab309…

MALICIOUS

PDF

54.8 KB Created: 2020-09-01 12:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d3e3448a8ea8da01fe528998491fc5f SHA-1: 34158977c1eb0ea9ed9bf93ae32c2826c083afc9 SHA-256: 6841dae4898ab309c3635380528aa617c938d3b9a45786d0817ab0a0b1fac266
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, identified as malicious. This suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'FDA guideline atopic dermatitis'. The presence of numerous external PDF links further indicates a link farm strategy, likely to obscure the malicious redirector.

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/wix?keyword=fda+guideline+atopic+dermatitis
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/11382599314.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/xuzelitotorepamemowime.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/32114564404.pdf
    • https://cdn.shopify.com/s/files/1/0436/2089/2834/files/66113287115.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e46784d0e14422c82fdf6e6567ef99a.pdf
    • https://static.usrfiles.com/ugd/5b604d_2a7fa3e9cb264c42bd1e9b326bb3b371.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f0ef534d9c14e938ebf0f527d2bec38.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/amrita_pritam_poems_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2932/files/napexatisowujixopojimifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/37227818141.pdf
    • https://cdn.shopify.com/s/files/1/0454/1464/5928/files/bayes_theorem_probability_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0461/9498/3075/files/21625926938.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/tapokulepufuvuxunaxigefaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/feriluberanebebixupaxopob.pdf
    • https://cdn.shopify.com/s/files/1/0428/7224/2342/files/2372076075.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_off00007df6.bin
066d62ca27b231d28a104d22898ed3cdad987c95b1d2ae0a0573201bd8dc3171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF6 5348 bytes
font_01_sfnt_off00009011.bin
e237f8df9fd148b7c93c75840621de352a0cb5b3fbd698ec62d4eec4ecfafab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9011 12672 bytes
font_02_sfnt_off0000b8fa.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FA 16204 bytes

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