Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcba58291f470a5…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 16:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29fac07d10cc329a68b58b0df75e9944 SHA-1: 6b4ada95cd2aa4c3b9357aa0ce325104e418a732 SHA-256: 8bcba58291f470a5a6fd9446578d22acab3f00365f24e8f758452ac6270e8310
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, however, directs to 'ttraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the text 'solid liquid gas worksheets pdf' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness.

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/wix?keyword=solid+liquid+gas+worksheets+pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3651/files/the_isle_of_dread.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/case_study_abstract_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/73455693584.pdf
    • https://static.usrfiles.com/ugd/b8c837_b16779b4134a4a3bb83104685d2841b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_14cb80bdcb40485c9783e7d101722bf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_623562211cd74c198580d61541629065.pdf
    • https://static.usrfiles.com/ugd/0789d5_e11740c3bbba470a92ddd113fe0043cc.pdf
    • https://static.usrfiles.com/ugd/cac9e4_06182a46e5f144e6b303d8e6bdb361b6.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/flower_brushes_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0439/6548/1118/files/amadeus_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/3725/3023/files/pdf_splitter_and_merger_software_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/bootcamp_drivers_windows_10_6._1.pdf
    • https://static.usrfiles.com/ugd/f63f29_a9ef833f42c6496fa6092e9207ba12ff.pdf
    • https://static.usrfiles.com/ugd/a91264_d571bf36474f4d93aca3e07a1099d2ed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054e2.bin
72c34802d89b67661a996b7d92760dd600d4d623ecfe89e61a053a02ec223fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E2 5464 bytes
font_01_sfnt_off0000678f.bin
509f4fcd91309aa8645a23faf9d7c76abcf56ad765d3d93075ba059f7ab7fad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678F 9996 bytes
font_02_sfnt_off000089be.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BE 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.