Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65ba5e7ed309f23…

MALICIOUS

PDF

41.1 KB Created: 2020-08-06 18:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199cb580f5c715f1cc1f866ca657d373 SHA-1: 66c3ea4469e3c24e9bc4cd12c22cbdddba13b6fc SHA-256: d65ba5e7ed309f231418f86a706a0b0b8bdb0fbd9ee5fc4395b5ddeb55a72d58
152 Risk Score

Malware Insights

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

This PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to educational materials, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, likely part of a link farm designed to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file.

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/pify?keyword=oxford+maths+book+for+class+6+solutions+pdf+free+download
    • http://files.frrcd.org/uploads/1/3/0/8/130814176/338224.pdf
    • http://files.downtownklamathfalls.org/uploads/1/3/1/4/131453329/7493c9fe2b76eb.pdf
    • http://files.andrewbgraham.ca/uploads/1/3/1/1/131164419/wolegirinusa.pdf
    • http://files.keyscientific.net/uploads/1/3/2/6/132681556/pobesebitis_xojaguluz_texapapikesemo_sixixeva.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/vajexebulosajufate.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/quantitative_ability_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3282/files/40777993756.pdf
    • https://cdn.shopify.com/s/files/1/0437/0438/5686/files/60123675563.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/43048381015.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/adding_and_subtracting_decimals_activity.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/cfd_solidworks.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/bivodoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6700/6364/files/dezogilurigaxeli.pdf
    • https://cdn.shopify.com/s/files/1/0447/1370/5625/files/three_column_cash_book_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.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/
    • https://cdn.shopify.com/s/files/1/0437/0438/5686/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c6.bin
8052849546c1eda93f3c8d185571c77930878e02ded8c77e2e0e3707302b61aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C6 5940 bytes
font_01_sfnt_off000075df.bin
b24b23a164f4831b1ab5fecfe48887c1aebaad965f164f44fe4dee4f7c83e45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DF 9528 bytes

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