Malicious PDF — malware analysis report

Static analysis result for SHA-256 0695aea6254f3e9b…

MALICIOUS

PDF

49.1 KB Created: 2020-10-04 10:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5bcfca9bec82c21cf77dfc7baf0a9bf1 SHA-1: 9e0d37d2d8a4440d59a213ea9c36361a11f07ee6 SHA-256: 0695aea6254f3e9bbcea05f9028999c2f7dd174ef92aeac69ae540c2e5c286fb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains embedded links designed to redirect users to malicious infrastructure. The document body, though heavily obfuscated, contains text and URLs that suggest a lure for downloading an application. The primary malicious URL identified is https://cctraff.ru/strik?keyword=download+aplikasi+apk+editor+pro+apkpure, which is flagged as a known malicious redirector. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=download+aplikasi+apk+editor+pro+apkpure In PDF document text
    • https://site-1041785.mozfiles.com/files/1041785/55089098241.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/20208215844.pdfIn PDF document text
    • https://site-1036828.mozfiles.com/files/1036828/1221455408.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/korozejaka.pdfIn PDF document text
    • https://site-1036910.mozfiles.com/files/1036910/ralikilu.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/bikazeveved.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/54117608030.pdfIn PDF document text
    • https://site-1036692.mozfiles.com/files/1036692/57499535761.pdfIn PDF document text
    • http://files.stoddardumc.com/uploads/1/3/2/7/132740204/815015.pdfIn PDF document text
    • http://files.answersformylife.com/uploads/1/3/2/6/132695701/kawuderisebokidik.pdfIn PDF document text
    • http://files.projectrijkleven.nl/uploads/1/3/1/4/131408432/2066531.pdfIn PDF document text
    • http://xesij.trinityjamestown.com/uploads/1/3/0/7/130738765/1ed3b4310ff1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE4 6588 bytes
SHA-256: 746cda19d0a45b0d6108c63ff8192b2f88c2fff5e5937e692a7cb04b31166607
font_01_sfnt_off00005e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5E 4988 bytes
SHA-256: 9208c3c8b40b2d9a17efce4a507fe1d4724e51d67f107dc54a9280d8967ed267
font_02_sfnt_off00006f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 6236 bytes
SHA-256: e1e77f23df4673610bb0fbc26e0c0809190f27c9b4055de5d2cd3243acdcb996
font_03_sfnt_off00008591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8591 10160 bytes
SHA-256: d094a5def822a2d1b83cce4d716fea985ba06df75c0da0acbaa52afd0b027c3e
font_04_sfnt_off0000a845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA845 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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