Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cc4018aa03112c…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 09:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8063e122e1a6918ab9b2dad3fca7f49 SHA-1: 333535be4c130bdfe8331a1d3b157b0ea44f73a9 SHA-256: 65cc4018aa03112cf6c5cbf1e8f5f014b6ca61eb15a3b9d5abac14e4cc9ac082
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, many of which are part of a link farm strategy. One critical heuristic identified a link to a known malicious redirector, suggesting a malicious intent behind the link farm. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be SEO manipulation rather than direct user compromise.

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=first+aid+psychiatry+5th+edition+reddit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/9691/4600/files/95760580210.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/novemenuzipikuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/95841073344.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/bikini_body_pre_training_guide.pdf
    • https://static.usrfiles.com/ugd/fe83c3_850c6bd1c2d749b698e88f3cacb91ec0.pdf
    • https://static.usrfiles.com/ugd/432b07_b1a1e677fe8a44e1beb8e516cd9ffc64.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1cf448b6cbc46a68b31134152d4f845.pdf
    • https://static.usrfiles.com/ugd/b8c837_65578ffde2174e11a61e8ae217c79e0e.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/rozerukubifezozuto.pdf
    • https://cdn.shopify.com/s/files/1/0437/9528/4130/files/543906002.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/tuhaf_bilimler_akademisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/mathematics_grade_12_study_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/rusajosavisovupukogor.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6604/files/44640022225.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/girotuditenosel.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/48438489470.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7645/files/holy_quran_with_bangla_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/86378753040.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049d4.bin
65d6c0dc6ad2300332a0768f7844124665f45de410f6213d8cbf127eec92edfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49D4 5096 bytes
font_01_sfnt_off00005b19.bin
62d63851651439b0e36acfeb4f2c380916ff323f0c97718317882723ab6638c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B19 9552 bytes
font_02_sfnt_off00007bb6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB6 4324 bytes

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