Malicious PDF — malware analysis report

Static analysis result for SHA-256 26289512fb790d6c…

MALICIOUS

PDF

36.8 KB Created: 2020-08-24 00:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b87efe0a08f8090e53d3bbddb37b1247 SHA-1: 305b45ea59b5a20c291c4a1de19b3f9ac35ca8f9 SHA-256: 26289512fb790d6ce132b45868d37992de51bd9a601ead9b68cec43dbc693328
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=microsoft+outlook+calendar+template+2016`. This URL is part of a link farm designed to redirect users to numerous other PDF files, as indicated by the `PDF_SEO_LINK_FARM` heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and references to Outlook templates, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=microsoft+outlook+calendar+template+2016
    • http://files.themixingbowlboise.com/uploads/1/3/0/7/130740318/5698579.pdf
    • http://vuxad.physicianmummyuk.com/uploads/1/3/0/9/130968961/birikixut.pdf
    • http://files.sweetearthjewelry.com/uploads/1/3/0/7/130740249/99747a69f444.pdf
    • http://files.laceyfisherlpc.com/uploads/1/3/0/8/130814935/zerupele.pdf
    • http://files.emmais.ca/uploads/1/3/1/3/131381414/9761575.pdf
    • https://cdn.shopify.com/s/files/1/0434/8916/5478/files/workforce_aptitude_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0447/2219/2537/files/cashier_job_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/91912400371.pdf
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/79107556415.pdf
    • https://cdn.shopify.com/s/files/1/0440/2947/7014/files/ibps_guide_insurance_capsule.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/nomafag.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3426/files/92937012111.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7732/files/zaxukumoweludesurojorogi.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_off00004351.bin
672a7e563fef1a8fe3ab9183037cd7c3a75c35b145a2473ce773b745fec50d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4351 5732 bytes
font_01_sfnt_off000056c2.bin
04415671a6fd8f4915cb56aa64a0bbfee1e0e1c9b4d2886f9a50f3011c4371ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C2 9744 bytes
font_02_sfnt_off000077fc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FC 4324 bytes

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