Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e6b6f598c14763…

MALICIOUS

PDF

36.3 KB Created: 2020-08-14 07:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d95f9f406529afd4aa56f51786a3c4e SHA-1: cde43098c0322a4b3b66379161c189e4f9152005 SHA-256: 25e6b6f598c1476336b2ac8e4216c0994278b23c4d332384b651fb1f6a292388
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=cg+video+hd+2018'. The document body contains obfuscated text and references to the malicious URL and a Shopify-hosted PDF, indicating a likely attempt to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=cg+video+hd+2018
    • http://files.splendiferousart.com/uploads/1/3/0/9/130969441/c5b1ebb7c8f8cf2.pdf
    • http://liwosaj.cbdworks.org/uploads/1/3/1/3/131383483/wetakonozorun.pdf
    • http://files.gilboe.com/uploads/1/3/0/7/130738841/fenokovorofov.pdf
    • http://podilas.glenealylibrary.org/uploads/1/3/1/8/131856158/tukisuzuvanizepov.pdf
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/cgst_act_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4485/files/wordly_wise_book_9_lesson_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/pojutojufode.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/85927200848.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/briens_caribbean_radio.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/40794479357.pdf
    • https://cdn.shopify.com/s/files/1/0445/8446/8644/files/employee_absenteeism_in_brazil.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/pofagosedixamo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4981/8024/files/free_pumpkin_carving_stencils.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/10984660604.pdf
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/65809844894.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7732/files/anger_management_skills_cards.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_off0000463b.bin
3ae9f72a2a63e9e83115b61be7921a82d9596376039378b3dbd4cc0e11dd4150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x463B 4776 bytes
font_01_sfnt_off00005687.bin
1bfb268bb8b89a41e8a853e5ce35d93200d923c9cc134a3298b81a5af6bf48e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5687 9400 bytes
font_02_sfnt_off000076a7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A7 4324 bytes

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