Malicious PDF — malware analysis report

Static analysis result for SHA-256 145873b43d622420…

MALICIOUS

PDF

42.3 KB Created: 2020-07-17 19:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f00f95f3f8fcf407c851933dd0be26 SHA-1: 095c11ef581b74fd43e51d86782772c2f0ed845a SHA-256: 145873b43d6224203d1d081d03030afe794cd8e4333baaaac38b72037e3dcea2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to external PDF files, indicating a link farm for SEO manipulation or to redirect users to malicious content. One URL, 'https://ttraff.cc/wb?keyword=engineering%20science%20n3%20question%20papers%20and%20memos%20pdf%202016', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=engineering%20science%20n3%20question%20papers%20and%20memos%20pdf%202016
    • http://files.sjrb-online.com/uploads/1/3/0/8/130813663/b4a8c5cf1a2267.pdf
    • http://files.livingwordpub.com/uploads/1/3/0/7/130738504/1538540.pdf
    • http://files.summerlandchurchoflight.org/uploads/1/3/1/3/131383842/166ba4bf.pdf
    • http://files.imagebunny.com/uploads/1/3/1/4/131437061/zexolapesadix.pdf
    • http://files.handymanservicesanchorage.com/uploads/1/3/0/7/130740033/rivopuvibipipiv-bozexeve-dilufazolototu-gitabopu.pdf
    • http://files.existentialbiker.com/uploads/1/3/2/3/132303099/gobob.pdf
    • http://files.epsteinbarrvirusnaturalhealth.com/uploads/1/3/0/7/130738821/5100723.pdf
    • http://files.columbusasphaltservices.com/uploads/1/3/0/8/130813546/5375164.pdf
    • http://files.fayettedentalaesthetics.com/uploads/1/3/0/8/130813988/kibina.pdf
    • http://files.islandfishingkauai.com/uploads/1/3/1/4/131453651/63e4b6b45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sutaxirelib345322610.files.wordpress.com/2020/07/gadorezamizeziwav.pdf
    • https://nalupewinebo.files.wordpress.com/2020/07/xuniloro.pdf
    • https://pilimiridap.files.wordpress.com/2020/07/60004741999.pdf
    • https://tejunif.files.wordpress.com/2020/06/31160693914.pdf
    • https://medidiri.files.wordpress.com/2020/06/vabap.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/30603953521.pdf
    • https://cdn.shopify.com/s/files/1/0430/8356/3162/files/66247595423.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/bifowetake.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/35368695575.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zigomotixiwututorevibalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/89985592217.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/zixatupuribevemajowoj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ed.bin
8aa6dbb75595ee93091aeab179f42a30b1f64baf80a315722842ce33307139af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 6052 bytes
font_01_sfnt_off00007566.bin
bd2bbbc1309300113e28ec51ec802353a7321bdc519886263aa30eb5c1db2db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7566 10816 bytes

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