Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2896f613f770ef5…

MALICIOUS

PDF

64.2 KB Created: 2020-08-30 07:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da3c6b61c0e1b41d9e98aeba61a41f0f SHA-1: 3f3ae0dee374b5eef3370a07a8d9e399616bcd1e SHA-256: b2896f613f770ef552d28bd3525b435f7078696b008e877b5533f6af1aa9eff5
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'tabla periodica' and includes the malicious URL. This suggests a phishing or scam attempt designed to redirect users to harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=tabla+periodica+en+espa%25C3%25B1ol+blanco+y
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/adobe_reader_convert_to_word_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/example_of_acknowledgement_for_project.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/xazamikabewinunaz.pdf
    • https://static.usrfiles.com/ugd/07625c_98c6cf71f91e4722b6237eb0f91dfcf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_8725122567ee40dab0aea424436dcdea.pdf
    • https://cdn.shopify.com/s/files/1/0443/9467/6390/files/rewalewopamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/90983973544.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/gofofomobasalajabinejubos.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/windows_xp_boot_process_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/35525058055.pdf
    • https://cdn.shopify.com/s/files/1/0448/3717/5456/files/christian_romance_novels.pdf
    • https://cdn.shopify.com/s/files/1/0432/6182/1092/files/jalosotitoko.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/jumbled_sentences_with_answers_for_class_5.pdf
    • https://cdn.shopify.com/s/files/1/0434/8716/6628/files/jigabimopapexutuganenir.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_off0000abde.bin
f2bbb0cdd3c7b2f0bfc3d7d8baf1a85a582a32e41ccdf998acf351cca3be7876
pdf-font-stream PDF embedded font (sfnt) at offset 0xABDE 5472 bytes
font_01_sfnt_off0000be39.bin
1e555fcef1bb2dba25656f394a575c899ca25a9b5c03cb3e3bbcf4e1b4d678f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE39 16928 bytes